materials: the coaster glasses are made of silicone, which is heat- and dirt-repellent, flexible and elastic, non-slip, not easy to deform and tear and is a good helper in life. [Non-slip]The silicone coaster is equipped with a special non-slip , the base can be easily stuck to the table, very firm, no worry about the cup slipping, there is no noise. [Away from Stains]The ribbed design of the silicone coaster can absorb more spilled drinks or sweat on a cold glass without causing spills and protect the worktop from stains and damage. Size: the diameter of the coaster is 9.95 cm, you can protect the desk from grease and water stains, and the coaster can also be cleaned in the dishwasher, which is very convenient and easy to clean Wide range of applications: you can use these coasters in the kitchen, dining room and living room, suitable for glasses, coffee cups, cold drinks, some containers with water to prevent the table top from wet color:Black Material:Silica gel size:10 x 0.5cm Package Contents: 12 x Coasters 1 x Storage rack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.