Anodised aluminium lattice frame to help with smaller bags and boxes. Vertical loop with P handle. Stair glides with replaceable low-friction polymer skid bars. Extruded aluminium toe-plate which folds for storage. Microcellular puncture-proof tyres on 3-piece reinforced steel hubs. Quality semi-precision bearings for smooth roll under load. Magnesium axle brackets. Solid plated steel axle rod.