... glass tube1. made of pyrex glass2. can print any color required to the surface of the tube3. high temp ... as cutting straightly, firing, melting, polishing, end-closing, frosting, color-printing and etc.. We are the member of China International Trade ... includes firing, cutting, melting, end-closing, frosting, color-printing, pattern and logo-printing and etc. We have electric annealing furnace, so we ...