kids bicycle here is our product's description: Handle bar Iron, MTB type, tendon,tube thickness-0.8 CP Grip ... wire, ED Grey B.B axle Iron, B type UCP Front fork Iron,Eng standard,front fork tube-Φ ... semi-closed, full chain cover Paint Carrier Iron,stick type, cushion ED Grey Chain Iron, 12#, 62parts/pc Freewheel ... Plastic Black-yellow Sidewheel support Iron, S type, plus thickness type, ED Grey Frame