The following casters are the best blend of price and performance. Many are priced like economical casters in the market, while providing additional benefits and features (i.e. precision ball bearings, proprietary treads, 100 bond to core, and 3 year wheel warranties). - Non-Marking - Ergonomic Tread Design - Reduction in Push/Pull Force Required - Deflects Debris (including metal and steel shavings) - Easy Roll Performance - Premium Precision Ball Bearings (6203) - 3 Year Wheel Warranty Made of exclusive proprietary donut tread. This caster comes with 6203 precision ball bearings and is bonded to a lightweight water-resistant aluminum core. The high grade elastic polyurethane reduces the force needed for movement and dampens vibrations for a smooth quiet roll. It also deflects debris, which strengthens its longevity and durability. Top plate size 4" x 4-1/2". FOB Shipping Point.