... smooth surface 3.safe and environmental 4.ISO 9001:2000 bicycle pedals We are a big company in China mainly manufacturing ... pin,hub,freewheel,chain,steel ball,fork,derailleur,grip,handle bar,mudguards,axle,bar end,basket,reflector,children bicycle,more than one ... factory,it has a good quality ,so it can be used for a long time.If you have any other questions ...