Silicone , No harm to your skin , Safe for you and your little kids to use Silicone Dimensions : app.15x10.5cm / 5.91x4.13in 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