Gunpla: Building Gundam Plastic Models

Learn how Bandai's snap-together Gundam model kits work, what the grades mean and how beginners can enjoy building their first robot.

Published October 26, 2026 at 8:53 AM JST | By Tokyo Paul

Quick answer: Gunpla, short for Gundam plastic model, is Bandai's line of snap-together model kits based on the Gundam franchise, first launched in 1980. Kits come on plastic frames called runners, and most need no glue and only a pair of side cutters. Grades such as High Grade, Master Grade and Perfect Grade describe scale and detail, from beginner friendly to advanced.

Few hobbies combine patience, creativity and fun quite like building a Gunpla. You open a box, find colorful frames of plastic parts, and within a few hours you hold a posable robot from one of Japan's most famous anime. The kits are designed to be friendly, so beginners can finish a model with a simple tool and a calm afternoon. This guide explains what Gunpla is, how the grade system works, which tools help, how to add finishing touches, and where to explore the hobby in Japan.

What Gunpla is

The word Gunpla joins Gundam and plastic model, and it refers to the plastic kits of Gundam robots made by Bandai. Gundam began as an anime in 1979, and the kits arrived the following year. Bandai Spirits says Gunpla was first launched in 1980 and that total shipments of the series exceeded 800 million units.

Wikipedia notes that Gunpla accounts for about 90 percent of Japan's character plastic model market. The kits helped turn a television show into a lasting hobby, and fans still build the robots seen in the original story along with many from later series. A separate guide on mecha anime tells the story behind the robots, while this guide focuses on the building.

Snap fit and how the parts work

Early kits needed glue, but modern Gunpla is much easier. According to Wikipedia, snap fit construction appeared with the Gundam Sentinel line in 1987 and became standard in 1988. Kits from the late 1980s onward typically need no glue or special tools, because the parts press together firmly.

The parts come on frames called runners, or sprue trees, a grid of plastic bars that hold each part through small connection points called gates. You cut each part free, clean the spot where it was attached, and follow the numbered instructions. Bandai molds colored plastic so that many parts already have the right color, and a technique called System Injection lets one part be cast in several colors at once, which reduces the need for paint.

Understanding the grades

Gunpla comes in lines called grades. Wikipedia lists the High Grade (HG), which began in 1990 and is typically 1/144 scale, the Master Grade (MG) from 1995 at 1/100 scale, the Perfect Grade (PG) from 1998 at 1/60 scale, and the Real Grade (RG) from 2010 at 1/144 scale with extra detail. The Entry Grade (EG) arrived in 2011 and is sold in parts of Asia, and Super Deformed (SD) kits turn robots into cute, chunky versions that are not scale based.

Size differences are easy to picture. Wikipedia gives the example that the RX-78-2 Gundam stands about 12.5 centimeters tall in 1/144 scale, 18 centimeters in 1/100 and 30 centimeters in 1/60. In general, larger and more detailed grades offer more parts and more internal frame detail, so they take longer to build. For a first project, a High Grade kit is a common choice.

Tools you actually need

The most important tool is a pair of side cutters, also called nippers, which snip parts free from the runners cleanly. Wikipedia states that assembly itself needs no special tools, and that a hobby knife is optional for finishing and a ruler can help with marking panel lines. A cutting mat protects your table, and a small tray keeps parts from rolling away.

Many builders add a few helpful extras over time. Sanding sticks or fine files can smooth the small marks left where a part was cut, and tweezers help place tiny stickers or decals. None of these are required to enjoy a finished model, so start simple and add tools only if you want a more polished look.

Building step by step

Start by reading the instruction sheet from front to back. Work in a bright space, and cut parts from the runner one section at a time, leaving a tiny piece of the gate and trimming it afterward with a knife or cutters so the surface stays smooth. Test parts gently, and never force a piece that will not fit, because checking the number often solves the puzzle.

Take your time with the joints, since they give the model its poseable fun. Take breaks when your eyes tire, and keep the box and instructions in case you want to check a detail later. Many builders enjoy finishing in one sitting, while others build a section each evening. Both approaches give a satisfying result.

Finishing touches

Once your model is assembled, small details can make it look sharper. Panel lining is a popular technique where a fine tipped pen or thin ink is used to highlight the grooves in the armor, which Wikipedia says makes the panels stand out. Stickers and water slide decals add markings, and careful painting can enhance specific parts.

Some fans use a clear protective coating to guard the finish, while others leave the model as it comes. The choices are personal, and you can improve your skills model by model. A simple, well built kit that you enjoy is just as good as a heavily customized display piece.

Where to explore Gunpla in Japan

Gunpla is made at the Bandai Hobby Center in Shizuoka, and Bandai Spirits says a new factory, which began operating in July 2025, handles production from molding through shipping. The company also runs a museum there. Bandai Spirits operates THE GUNDAM BASE, a space for the hobby, and Wikipedia notes that a base in Tokyo's Odaiba area replaced the earlier Gundam Front Tokyo.

Hobby shops, department store toy floors and large electronics stores across Japan stock kits, and some sell limited editions. Events and exhibits change, so check the official Gundam and Bandai Spirits websites before you plan a visit. Fans who enjoy giant robots can also read about Yokohama's Gundam attraction in another guide.

Contests, community and recycling

The hobby has a strong community. Wikipedia describes the Gunpla Builders World Cup as an annual international contest held in at least 16 countries, where winners receive trophies and model kits. Many builders also share their work online.

Bandai Spirits has also started a Gunpla Recycling Project for sustainability. This fits a hobby built on careful, mindful craft. Whether you build one kit or a whole shelf, Gunpla rewards patience and a bit of imagination.

Want to go deeper? Tokyo Paul's book Japanese Capsule Toys (Gachapon) is available on Amazon.

Frequently Asked Questions

What does Gunpla stand for?

Gunpla stands for Gundam plastic model. It refers to the plastic model kits of Gundam robots made by Bandai, which were first launched in 1980. The kits come on plastic runners, snap together without glue, and range from beginner friendly sets to large, highly detailed models with many parts.

Do you need glue or paint to build Gunpla?

No. Modern Gunpla kits use snap fit construction, so parts press together without glue, and Bandai molds the plastic in colors so the model looks good straight from the box. Side cutters are the main tool. Paint, decals and panel lining are optional ways to customize a finished model.

What is the best Gunpla grade for beginners?

Many beginners start with a High Grade kit, because these are smaller, usually at 1/144 scale, and quicker to build. Master Grade and Perfect Grade kits have more parts and detail, so they take longer. Choose a robot you like from the series, since enjoying the design makes building more fun.

Keep Exploring

More guides from Tokyo Paul: Gundam: Japan's Giant Robot Icon, Mecha Anime: The Giant Robot Genre Explained and Anime Figure Shopping in Akihabara.