The Ultimate Strength Series is the best in American technology. With its roto molded tough shell, front and rear lids, recessed heavy-duty twist latches, molded in handles, shock absorbing rubber feet and the recognizable patented deep Roto-X pattern for solid stackability, these cases provide maximum protection. The unique molded-in unbendable valance and steel threaded rails make the Ultimate Strength Series Roto-Racks the new professional standard in the industry.