Mirka Q-Silver 77mm Velcro Discs are an abrasive with optimal aggressiveness to achieve fast and efficient stock removal. The product possesses high heat endurance and is tough in down-to-metal sanding operations, for example in automotive lacquer sanding. The performance in sanding of hard wood and composites is also extremely good. The backing consists of a flexible and strong impregnated latex paper. Please note that these are 77mm no hole sanding discs.