NATURAL MATERIAL - These wooden drink coasters are made of natural bamboo, which is hard and lightweight. The surface is polished smooth and round without burrs. So it won't hurt your hand. They are more resistant to fall than plastic or ceramic coasters. PERFECT SIZE - The package included 30 round bamboo coasters with an external diameter of 3 inches. It has a height of 0.4 inches and comes with a shallow recess with a diameter of 2.7 inches. The recess is suitable for holding format cups and small potted plants.