2 Inch Nylon Pulley Roller Wheel Bearing Guiding Wheel Flat Belt Idler Product Highlights: Please refer to the item drawings for the precise dimensions. The product is precisely machined from the high quality (Quadrant) cast nylon known as PA6G. Because of Nylon's versatility, it is one of the most widely used engineering thermoplastics for the following reasons: Excellent abrasion resistance High toughness (Strength) Good chemical resistance Excellent impact strength All Bearings used in our products are the high-quality ball bearing rubber sealed (RS) or steel shielded (ZZ).