Square Bamboo Coaster keeps it simple for your logo to be the center of attention! The coaster is made of natural bamboo with reusable, non-slip, environmentally friendly and heat proof to protect tabletop. Features hollow out design in the middle, helping to heat and drain water, not easy to mold. Using round edge grinding process makes it more smooth and exquisite. There are four anti-slip rings at the bottom of the cup to double the anti-slip effect. Perfect using under cup, bowl, pot, etc. Obvious imprint area is perfect to show your brand and logo. (The texture of each natural bamboo coaster will be a little different.)