33 COE borosillicate glass rod by Northstar 

NS-104 Unobtainium is a very dense gun metal blue with lots of sparkle. It is well suited for stringer application and blown work. It is easily worked and can take a lot of heat.

Diameter: 3/16" - 5/16" (5mm-8mm)

Length: Approximately 20" (51cm)

Rods sold by 1/4 lb

*Please note: our totals may vary slightly.  We charge for exact weight shipped and will try to ship exactly what you order, but the weight may vary slightly.