The Desco 45000 Statfree J Dissipative Shock Resistant Foam Rubber Roll, .125 in. x 24 in. X 40 ft., is made from non-skid foam nitrile butadiene rubber, which provides a cushioned surface that PCB and other products will not slide off. The dissipative worksurface controls charge removal from ESD susceptible items, meeting the ANSI/ESD S20.20 worksurface required limit. The level of volume resistance allows the mat to electrically couple to the grounded ESD mat it is being placed on without a separate ground cord.