Mix gas 25 ppm H2S - 100 ppm CO - 2.5% (50%LEL) Methane (CH4) - 18% O2 N2 Balance Vol : 58 Liter Cylinder Type : 8AL Aluminium Cylinder Recommend using regulator 715 Provide COA & MSDS Suitable for Calibration or bump test for BW Honeywell, MSA, Crowcon, Draeger, Riken, Rae and All Gas Detector