GG25 V belt pulley ceramic pulley pulley,3",3.5",4",4.5",6",6.5",7", ... ",16",18",20",22",etc.we can sup GG25 V belt pulley ceramic pulley pulley,3",3.5",4",4.5",6",6.5 ... ",18",20",22",etc.we can supply many kinds of pulley. 1). Material: GG25 iron alloy or according to your ... ;7. Quality control system;8. Service;6)Sand Casting Process:Design and build the mould → Molding the Sand→ Melt and Injection ...