Vestil Cst-Ve-4X1.25Pp-Swb Polyurethane/Polyolefin Swivel Caster Top-Lock Brake 4 In. Diameter X 1-1/4 In. Width 3/8 In. Single Ball Bearing 2-3/8 In. X 3-5/8 In. Top Plate, 350 Lb. Capacity Black/Gray

Professional grade liquid cast 100% polyurethane mechanically bonded to an engineered flow-through polyolefin core. The unique polyurethane formula can avoid disintegration problem which the usual plastic wheel would face, and provides 5 times longer wheel tread life than general wheels. Polyurethane wheel resists oil, grease, water, and most solvents. High capacity and light weight for ultra-ergonomic performance.