Plastic products: 1.Material:wheel'smaterialisPA or POM,the frame is iron with zinc plating or zinc alloy etc. 2.Widely used in all kinds of windows and doors,the max.load can reach to 130KG. 3.Push easily,run smoothly,strong abrasion resistance,strong resistance to shock,strong aging resistance. 4.Material,size,color,styleisoptional,standardproductsandcustomizeditemsareallwelcome. 5.Highqualitywithcompetitivepriceandfirst-classservice 6.On-timedelivery 7.ISO9001:2000