Waterproof Mat for aquascaping, water changes, etc

This is a silicone or vinyl waterproof mat (not sure what it's made out of)... I use these to protect wooden floors or rugs when I'm working on tanks in the living room. Measures 23"x17". Originally designed for crafts use /working with small parts - the textured surface prevents small parts from rolling away. Photo shown is a used one, but auction is for a brand new, unused one.