GLASS IS SOLD BY THE WEIGHT. PREFERRED SHAPES AND SIZES CANNOT BE GUARANTEED. IF THERE IS A DOUBT, WRITE FIRST WITH QUESTIONS! SMALL 8-12 oz MEDIUM 12-18 oz LARGE 20-30 oz XLARGE 31-40 oz JUMBO -a huge chunk of glass... up to 80 oz (5 pounds) larger pieces available upon request. Chunk of Slag Glass. Great for gardens, aquariums, or just putting it on the window sill to watch the way it catches light! GLASS IS SOLD BY THE WEIGHT. PREFERRED SHAPES AND SIZES CANNOT BE GUARANTEED. IF THERE IS A DOUBT, WRITE FIRST WITH QUESTIONS! SMALL 8-12 oz MEDIUM 12-18 oz LARGE 20-30 oz XLARGE 31-40 oz JUMBO -a huge chunk of glass... up to 80 oz (5 pounds)- larger available upon request.