System 96 Casting Rocks System 96 Casting Rocks are random-shaped "rocks" that are an excellent casting material for small projects. 3 lb. jar.
Casting rocks are unannealed random shapes between the sizes of grapes
and baseballs. They are a low-cost source of premium formula casting
glass made with the same kiln-casting formulation as Uroboros System 96 glass billets. If your casting does not need the low bubble count and uniform
shape of Casting Billets, choose Casting Rocks as an economical
alternative. Each container has a variety of piece sizes, so you can
pick the size and weight you need to fit any mold.
