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Features Resistant to high temperature and corrosion High quality Borosilicate Glass Blowing Tubes OD 7mm 300mm LengthFire polished in both sides Applicable Apply to home school factory laboratory and so on Specification Material Borosilicate GlassColor TransparentLength 300mm 11 8InchOuter Diameter 7mm 0 27InchThick Wall 2mm Package includeds 10 x Glass Tube Details pictures