... bearings; Pivot bearing widely used in building line and furniture. Nylon wheel pulley bearing fittings 1)Plastic pulley outer ring is ... made of plastic materials (POM, PP, PA, nylon), with excellent surface for sliding windows and doors 2) Inner ring is made ... made of plastic materials (POM, PP, PA, nylon) or metal material, with excellent surface for sliding windows and doors3) The inner ring ...