... supply series of mud system equipments, also supply series of brake pads for drilling rig PS series Hydraulic Disc Brakes, which ... , ZJ40, ZJ30, ZJ10 and drawworks JC10B. JC30. JC50D. JC70D. These brake pads, made with kinds of import environmental protection material basing ... -50, PSZ-25, PSK-A, PSK-G, PSBJ-40, PSBJ-30 Material formula: Ceramic, Semi-metallic, Low metallic, Non-asbestos composite ...