Sewing Magnets are great for applications where magnets need to be sewed into fabric and occasionally washed. The magnets are encased in a soft Thermoplastic Polyurethane (TPU). The material can be sewn directly into the fabric. Magnets come in pairs, and work in pairs to attract to each other. Often used in the costume industry to produce clothes that can be securely closed and rapidly changed without the need for buttons or other manual closures.