The GEM Dandy Rubber Cork Compound Mat is manufactured using a specific formula of two types of rubber with differing energy absorption characteristics. Cork is added to aid in the transmission of energy into the mat.This compound allows the mat to damp the vinyl and decouple the platter energy to a degree that only lead would achieve in the past. (Merrill Lead Mat)A very economical way to improve the performance of any turntable. Made in the USAA review in Dagogo.www.dagogo.com/practically-priced-tools-for-the-lp-lover/2One eighth inch thick. Label depression .067 inchDiameter 11 5/16"Weight is 8 oz.