Wheel Type: PU Solid Foam For Use On: Firm Surfaces Wheel Dimensions: 20 x 6 cm (7.8 x 2.4") Wheel Weight: 0.81 kg (1.79 lbs) Payload Capacity: 72 kg (158 lbs) Axle Material: Marine Grade Anodized Aluminum Axle Dimensions: 20 mm x 72.4 cm (0.75 x 28.5") Clearance Between Wheels: 57 cm (22.5") Hardware Material: Stainless Steel