These colorful magnets are designed to be used with CocoKnits Maker's Board. This magnet set is made from plastic free PLA (plant based fiber) and very strong magnets. So strong, both the front and back will hold. It includes 6 discs with embedded magnets that can hold patterns, charts, or recipes on the Maker’s Board, or use them for artwork and notes on the fridge or a metal message board! The PLA is formed around the magnets, no toxic glue was used to secure them and they won’t come out.