© www.learnglassblowing.com                       webmaster@learnglassblowing.com  learnglassblowing.com does not sell glass materials. We recommend ordering from the suppliers below. Each supplier has a complete line of clear and colored glass tubing and Rod. Make certain that you order Borosilicate glass with a COE of 33. Order glass materials that have a Coefficient Of Expansion (COE) of 33 DO NOT MIX GLASSES THAT HAVE DIFFERENT COE’s WHEN GLASSBLOWING!