1.Caster Size:2"/3"/4"/5"/6"/8" 2.Wheel Material:TPR/PP/PU/ ... , double ball bearing , bushing , delrin bearing , plain bearingFeatures:1. Easy to use 2. Rotary Flexibility3. Quiet while sliding4. Floor ... handcart, hospital , logistics hand trolley, trolley ,etcOur advantage/service:1. We are manufacturer.2. Good quality, favorable price and ... with us. Top plate heavy duty locking swivel caster wheels