The 500Y Backing Plate is a perfect backing plate made for any pneumatic polisher. Developed by industry professionals this backing plate is made with composite graphite plastic helping it to still have a strong rigid center base. While yet the outer edge is devised of a polyurethane rubber also known as the Flex Edge. This flex edge outer layer was design to provide a more absorbent cushion While buffing over contours of the Car. Build for the toughest of jobs the 500Y backing plate is for use as high as 6000opm or osolations per minute.