Sporting a lightweight steel frame and patented pull-pun technology Caravan's M-Series Pro 2 12x12 Canopy is a blend of commercial-grade strength and recreational-grade portability. The M-Series Pro 2 uses Caravan's rising truss system which features reinforced truss bars that give additional head room. The Pro 2 uses a lightweight steel frame and aluminum corner brackets for added durability. Bolted frames are easily replaced. Lightweight steel frame aluminum brackets Bolted frames easily replaced | Caravan Canopy M-Series Pro 2 12x12 Canopy in Blue