MCWlaser RECI CO2 Laser Tube 75-150W for Engraving & CuttingThe RECI series laser tubes with advanced production processes, superior performance,stringent testing standards, high quality materials, and universal compatibility. and can It can replaced the original old mode S1,S2,S4,S6 S8 and also new model W1,W2,W4,W6 and W8 which was produced at any time . Feature About 10000 hours service life, tube 18 months warranty for W1,W2, and W4 12 months warranty for W6 and W8 laser tube. If there are any problems