These are probably the best coaster you will ever use. Each coaster is super absorbent and 4" in diameter. Made from two different materials: the polyester top traps the moisture and the thick black rubber backing protects your furniture and doesn't slide. Ever pick up your glass with the coaster still attached only to fall off when you don't want it to? Scott's artwork is embedded into the surface of each coaster through high heat and pressure. The design will not wear off! .