1)With double bearing 2)it is PU caster 3)Good cost performance: anti-friction, good ... resistance, high load bearing Specificaton: PP, PVC, POM, PU caster with brake or lockingThe features of our casters: 1 ... impact resistance, high load bearing. 5.payment: after 30% T/T, advance delivery. 6.packing: bulk in cartons then in wooden ... size of this series. 2.5"Double bearing PU wheels for trolley cart