High quality metal material. Strong & durable, Fully protecting your GPU and electronic device. Accelerating the air convection. Super cooling design for heat dissipation. Enhancing the cooling and extending the service life of graphics cards. Professional design. Non marring and non-slip rubber feet. EVA Foam on the cross bar to prevent your graphic cards. Easy & fast installation in 20 minutes with detailed guide and video instruction. The frame only. Not includes fans or other CPU, GPU, PSU, motherboards, cables. USA brand. Ship from USA. Full support and warranty. AAAwave Sluice V2 Mining Frame Stacking Brackets - Black