Neodymium magnets, approximately 3mm in diameter, 1mm in height, set of 40, circular. These are small magnets that can be inserted into 3mm holes, commonly used in Gunpla, 30MM, 30MS, Megami Device, and garage kits. Embedding them with adhesive is convenient for concealing connection points and modifying pin-cut connections. They are useful for stabilizing weapon holding in plastic models, fixing the position of telescopic parts, opening and closing car model doors, preventing falls by embedding them in the soles of action figures, and modifying the removal of the Gundam Aerial's bit attachment pin holes. These are not high-quality, like those from HiQ Parts, so they may not be exactly 3mm, and there might be some that are tight or loose. They are small and thin, so they can't support very heavy items, but you can increase the magnetic force by stacking them. They are not the size and thinness you can find at 100-yen shops. Besides modifying plastic models, they can be used for temporarily fixing paper and memos, crafting handmade items, making magnetic earrings, and many other applications that take advantage of their small size. Additional magnets are available for 10 yen each. 2mm magnets and other quantity sets are also available. The unit price decreases as the quantity increases. Please inquire if the required quantity is not listed. Target age: 14 years and older. Please be careful with handling and storage to prevent accidental ingestion by small children.