Cheng Concrete Countertop Pro-Formula Mix - Charcoal CHENG Concrete Countertop Pro-Formula is designed for Precast Concrete Countertops. Each pre-measured bag yields 1 cubic foot of mix when combined with 120 pounds of concrete High-quality pigments provide vibrant, stable, long-lasting colors Special admixture modifiers deliver stronger, smoother counter top surfaces Shown in a grey-based concrete mix and a ground and polished finish