... made by aluminium-alloy for pneumatic cylinder ,ISO 6431,DNC,MB,DNG,SC,,SU,TN,STM,CK diameter form 32mm~320mm2 ... factory conforms to the ISO9001 standard !6:We provide OEM&ODM service !7:We have many linear cutting machine ,high speed ... mold according to customers request!! pneumatic cylinder kits (air cylinder)MB series