The FOX Performance Elite Series 2.5 Adjustable Reservoir Shocks provide outstanding dampening power and lift for your Jeep. It leads with a premium-grade, CNC-machined 6061-T6 billet aluminum construction and smooth body remote reservoir shocks, for outstanding ground clearance, comfort and performance. Specifications Body 2.5" Metal impacted 6061-T6 aluminum will resist rust over time Body Plating This unit comes with a clear-coated, zinc-plated finish for outstanding durability on the trails. It also comes with JM92 advanced suspension fluid for outstanding variable temperature performance. External Reservoir 2.5" Smooth Bore 6061-T6 billet aluminum Components Black-anodized, CNC-machined 6061-T6 billet aluminum Shaft 5/8" hard chrome plated heat-treated alloy steel Piston Race-developed high-flow piston design