This hollow rose pattern coaster. Good size to suit most cups/ mugs. Never have to worry about risking a spill if your cup is not centered. Friendly to any furniture surface while providing a firm grip to the table surface but never sticks to the bottom of your cup or glass, hot or cold. Made of durable silicon,Heat resistant and non slip. Simple and eye-catching design, it is amazing to hold the cups or tableware. Perfect for daily use, great accessory for household or other places. The diameter is approximately 3.9" inches, the thickness is 0.06" inches. We have hollow out coasters and rose coasters. Welcome to inquiry.