It is durable and can be used over and over again for versatile stamping. Material: It is made of silicone, it is reusable and it is easy to clean after using. It is also safety to kids. You could use this to let kids to learn the letters, different shapes and many other things from the sheets. Design your envelopes, card, letter, diary and others. Fantastic design for your invitations/ cards/ envelopes. Features: Self clinging and repositionable-can be used over and over again for versatile stamping