3M(TM) Finesse-it(TM) Microfinishing Film Type D Disc Roll 268L, 1 3/8 in x NH x 1000 in Die# 143S 9 Micron Scalloped, 4 per case Fast cutting abrasive for precise, uniform, close-tolerance finish. High-strength polyester film backing aluminum oxide resin-bonded to a 3 mil polyester film backing for durability. Easy to re-use. Use wet or dry for finishing a wide assortment of workpieces. Precision micron-grade aluminum oxide ,anti-loading fre-cut caoting,for plastic,fiberglass,wood,metals and solid surface