... high temp resistant borosilicate colored glass tubes with all kinds of colorscolored glass tube1. made of pyrex glass2. can print any color ... tubes and can do deep processing to them, such as cutting straightly, firing, melting, polishing, end-closing, frosting, color ... high borosilicate glass tubes, no matter with hot or cold processing, which includes firing, cutting, melting, end-closing, frosting, ...