1.Frame:High-finish aluminum alloy 6061 2.Handle:6061-aluminum alloy 3.Gear:shimano inter-3 intermal gear hub 4.speed:3 speeds 5.chain wheel:aluminium alloy 6.Rear brake:shimano roller brake 7.wheels:16"aluminum alloy 6061 8.seat Fabric:Enviromental ,waterproof ,non-flammable and Removable for easy cleaning 9.Tricyle dimensions(cm):73*165*102(W*L*H) 10.stroller dimensions(cm):73*120*102(W*L*H) 11.Net weight :26kg 12Conversion time:20 seconds