3M™ Microfinishing Film Roll 372L, 9 Mic 5MIL, 0.748 in x 600 ft x 3 in (319mmx182.75m), Plastic Core, ASO, End Roll Mark Black Min Qty Order:3 resulting in an open web resulting in an open web that is responsive and durable enough for deburring Better results due to even pressure distribution between the abrasive and work surface Our 3M™ Microfinishing Film Roll 372L features micron graded premium aluminum oxide bonded to a 5 mil polyester film backing to deliver uniform results and meet stringent surface requirements A friction grip coating provides slip resistance for microfinishing machines where film slippage is an issue