Ball and spring design. Aluminum alloy construction, and not easy to get rusty. Knurled ends provide a slip free grip when making adjustments. Easy to install, but professional installation is highly recommended. Universal fit for turbocharged vehicles. and High quality. Car accessories and Motorcycle accessories, , Decoration include: Auto Replacement Parts, Nuts & Bolts, Glasses & , Switches & Relays, Wheels Tires & Parts, Exterior Parts, Gear Shift Knob, Air Conditioning & Heat, Exterior Accessories, Car Stickers, Motorcycle Ignition, Interior Accessories, Key Case for Car, Tools Maintenance & Care, Tire Repair Tools, Cables, Adapters & Sockets, Car Light, Motorcycle Accessories & Parts, Wheels & Rims. This manual boost controller is used to adjusts the pressure of the turbocharger system and guarantees stability of the system. It helps to enhance the overall performance and reduce harmful emissions. Made of aluminum alloy, quality and performance guaranteed! Colour:Black Material:Metal Size:2 x 7.7cm/0.78 inch x 3.03 inch Package Contents: 2 * Boost Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.