1.the adoption of aluminium material(main post),which can be avoid the rusty problem totally.

 2.the application of new technique,first,praying the zinc-rich premier,second,praying powder

 coated before blasting them.

 3.the application of hot-galvanized steel pipe,the thickness is almost 3mm.

 4.the seat and the pedal apply for soaked-PE/PVC,so as to meet your requirement for the cold

temperature in winter