Specifications:
Compatible with Pyrex and most other commercially sold Borosilicate glasses.
Rod Length 49 - 45 cm
Diameter 5-8mm
approx. 30 rods per kg
Annealing Temp 565 - 600°C

When working a self-striking Ruby, work in a hot neutral to oxidizing flame. You will note that as the glass heats up it will turn clear just like a standard Ruby, but as it cools down it will strike to a specific shade that is dependant on its copper concentration.