1.5 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).