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The 365L discs (grades P220-P500) are constructed of a high-performance aluminum oxide mineral. The 765L discs (grades P80-P180) are constructed of a uniquely blended material. Both are strongly bonded to a smooth film backing. Excellent for use on tough marine paint, gelcoat and primer systems. The 3M™ Hookit™ II Attachment System allows for easy application to and removal from the disc pad