... type:Casing: STC, LTC, BTC, OTTM, OTTG, BTO, NEW VAM, VAM TOP, VAM FJL, VAM ACE, FOX, Hydril, Hunting etc.Tubing: NU, EU, XL ... , PH-4, PH-6, LTC, STC, BTC, NEW VAM, VAM TOP, VAM FJL, VAM ACE etc. 4. AssuranceAPI/ISO quality system, SGS, DNV ...