System 96 Casting Rocks

System 96 Casting Rocks are formulated from Uroboros's unique ultra-low devitrification glass formulas.

These formulas were designed specifically for the long firing schedules needed for large-scale kiln casting, and provide excellent optical brilliance and unusually bright colour hues. 

Casting Rocks are formed from this high quality glass into an economical, random sized "rock" forms between the size of grapes and baseballs.  

Casting Rocks are un-annealed.  If your casting does not need the low bubble count and uniform shape of Casting Billets, Casting Rocks are a low cost alternative.