3M Microfinishing PSA Film Disc 366L, 60 Mic 3MIL, Type D, 5 in x NH,Die 500X

This mineral makes a tough, durable abrasive that self-fractures to expose fresh cutting edges, whereas traditional natural abrasives dull more quickly. Due to its fast cut-rate, hardness, and strength, it is widely used in grinding applications in addition to sanding and finishing applications.