Single Sided Gray Foam Polishing Pad used to remove compound swirl marks and fine paint surface defects Flat back design For use with 3M™ machine polishes and 3M™ Hookit™ back up pads, 05717 or 05718 Proven performer Convoluted foam face produces wheel/swirl free paint finish when used with 3M™ Perfect-It™ Machine Polish (06064 or 06065) .