Gelbee Gel BBs, 20,000 Count, Blue . Compatible with Gelbee Wildfire Blasters 50 Hopper Reloads Made of Super Absorbent Polymer (SAP) Eco-friendly,non-toxic,non-staining Just add water to expand to 10x size* 20,000 gel BBs . *Dry Gel BBs are approximately 6mm in size. Once they are hydrated, they expand to approxiamtely 7.5mm .