I have a lot of scraps. I don’t know the coe of the glass pieces I have, but I know they aren’t the same. No matter…dump them together in this mold and make glass slabs. Some look good, but I will be honest and say some are hideous. Then I break them into thick chunks I put in a rock tumbler. That’s when they become beautiful. For zen stones, glass mulch, anything you want thick glass globs for.