PB661 is a beige stearated abrasive with aluminum oxide and double urea resin, designed for a clean, controlled and long-lasting finish. Its anti-clogging zinc stearate layer improves durability, while the flexible B-weight backing adapts to flat and curved surfaces without losing stability. Ideal for metal, paint, plastics, wood and composite materials, PB661 is widely used in body-shops, woodworking, shipyards, plastics processing, aerospace and DIY applications. Available in grits 80–1000.