Silicone, No harm to your skin, Safe for you and your little kids to use Silicone Dimensions: app.10x15cm / 3.94x5.91in Uses: notebook, card, invitation card and so on Perfect for scrapbooking, card making, paper theme invitations, pocket scrapbooks, album decoration, photo frame etc.A good your kids to cultivate their hands-on ability Your self-made gift will be a big surprise to your and friendly clear stamps Perfect for Scrapbooking, Photo Albums, Decorative Paper, Holiday and Birthday Cards and lightweight, not easy to break, you to use for a long time, just press on or card gently please note that clean and wash with water every time done for next time using conveniently