10pcs/lot Transparent Pyrex Glass Blowing Tubes 12mm Od 100mm Long Thick Thickness Wall Test Tube 10*100mm Wholesale Test Tube - Test Tube - AliExpress
Amazon.com: PQAPGT Colorful 4 Inch Long 5 Colors 10 Pieces Glass Borosilicate Blowing Tubes 12 mm OD 2mm Thick Wall Tubing : Everything Else
Small Glass Tube Glass Tubes for Blowing Soda Lime Glass Tube - China Small Glass Tube, Glass Tubes for Blowing | Made-in-China.com
Amazon.com: PQAPGT 6 Inch Long 5 Colors 10 Pieces Glass Borosilicate Blowing Tubes 12 mm OD 2mm Thick Wall Tubing for Various Applications : Everything Else