These Coaster are made of cork wood which durable and not easy to break. The cork strip has anti-slip surface and good adhesion on the back. And its cork wood material which has the effect of heat insulation. Also its self-adhesive which easy to stick and convenient. Feature - Color: As shown. - Material: Cork .- Size: 10 x 10 x 0.5cm. - material : these self-adhesive cork is made of natural wood ,anti-slip surface and good adhesion on the back,durable and sturdy, not easy to break.- Surface can be written : the color of the wood makes the writing feel elegant and chic, you can add a variety of personalized text on its surface to make your DIY cork squares attractive and special .- Perfect for coaster shoice: Unique shape make it can be use as an coaster, also can be use as great decorative or base for potted plants. - Wide application :It can be applied in office, school and home for reaching the effect of resist the hot temperature, also can work as decorative gadgets, make your room full of vintage feeling - Unique ShapeDesign: the cork has anti-slip surface and good adhesion on the back, with pure wood color without any pattern, has the effect of heat insulation.-Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you Packing list40 x Cork Strips