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 - Smooth Ride Performance - Quiet Operation - Deflects Debris (Including metal and steel shavings) - Excellent Floor Preservation - Premium Precision Ball Bearings - 3 Year Wheel Warranty Made of high grade proprietary thermoplastic rubber (TPR). This caster offers paramount floor preservation and impact resistance. The soft tread provides a smooth quiet ride, while still being durable enough to deflect debris. The high-quality tread resists water, steam and most chemicals. Top plate size 4" x 4-1/2". FOB Shipping Point.