Heavy duty reusable plastic mixing bags. Designed to mix up to 80 lb. bags of cement in a few quick minutes. No set of tools, oversized wheelbarrows, large concrete mixing tub, bucket, mortar box, hoe, or shovel required. No mixer or machine! No blankets. No other clean up! Neodymium powder or other coloring agent can be added directly in the bag. Excess concrete may be left in bag to be discarded. **Enjoy the quickest way to mix up your next DIY project!**