50W CO2 Laser Tube with Borosilicate Glass for Laser Engraver & Cutter Machine（Not compatible with the Polar series machines.)Replace your old laser tube and optimize your laser engraver and cutter machine's performance with OMTech's highly efficient 50W CO2 laser tube! Made of tough borosilicate glass, this 850 mm (33. 4") long 50 mm (2") wide CO2 laser tube is superior to its competitors as it incorporates gold catalyst nanocoating and high end German technology into the engineering of its glass tube construction, making it more durable to withstand high temperature and