This Coaster is 4 x 4 and has a beautiful gloss finish. It is approximately 1/8" thick with rounded corners and come in two options; a nonslip rubber back or a sturdy Hard Back (see Pictures). There are four designs to choose from or you can purchase a a set. The designs will be fused into the surface of the coaster making it indestructible. The photo will NOT FADE, PEEL OR CHANGE IN ANY WAY... it will last a lifetime!!! The Hard Back coaster comes with rubber feet preventing it from slipping on any surface. I look forward to creating something unique and special for you. Thank you for visiting my Store!!