1GG17 glass tube, strong thermal stress resistance, more resistant to high temperature, not easy to crack. 2Stable output, laser single mode output spot, fine, faster cutting speed, higher power output. 3The metal head surrounds the locking laser tube, and the coating process increases the output power and discharges stably, prolonging the service life. 4High power output makes the working more steady and stable. 5Professional and practical design with beautiful appearance, easy to use.