Neodymium disc magnets sealed in waterproof PVC film are used as sew-in magnets. With the durable PVC film, these neodymium disc magnets can be sewn into clothes, they are washable in the washing machine.We have round and square shaped PVC cover. So, you can choose the right version to use.What you are looking at now are rustproof sew-in magnets with round shaped PVC cover. Because of the closed PVC film cover, the sew-in magnets are rustproof and waterproof, which means that the neodymium magnets are usable outdoors. The rustproof sew-in magnets are sold and used in pairs. To use it correctly, you must make sure that the two sew-in magnets attract each other.