Terrazzo grade decorative aggregate made from recycled glass & marble. Decorative aggregates, such as colored glass or crushed stone, can create a very unique concrete countertop or concrete floor. This is not very difficult and creates a total custom look. It does require more work that just pouring it into the concrete because you need to expose the aggregate through careful grinding and optional polishing. All options are recycled glass or marble, and are tumbled to reduce the sharp edges. Not sharp (unlike recycled glass made from old bottles.) 1 lb bags. 1/4 to 3/8 inch stones. 1 lb nicely seeds about 4 sq ft of countertop or terrazzo flooring.