Rolled Lava StoneExperience the rugged beauty of lava rock with a new smooth finish with the Rolled Lava Stone by HPC Fire. The rolled stones still have the porous design and nature of a lava rock but without any jagged edges thanks to the rolling process. Size Specific Small: Rocks sized between 1" 2" shipped in a roughly 50 lb. bag which provides 1 2 Cubic Foot of coverage. Medium: Rocks sized between 2. 5" 4. 5", shipped in a roughly 60 lb. bag which provides 1 2