This Festool Cristal 80 x 133, 40-grit Abrasive is Compatible with Festool RS 400, RTS 400, and LS 130 sanders for heavy-duty applications. Festool’s Cristal abrasive stays cool, won’t clog and makes short work of tough jobs. Cristal employs a durable aluminum oxide that cuts, rather than grinds, the material surface, leading to faster material removal and a cleaner finish. Cristal employs a flexible bonding material and no-load coating, making it the ideal abrasive solution for rapid material removal and stripping. Comes in pack of 50.