Fangrui Product Details Brand New.high Quality!easy To Install With Simple Hand Tools. Its Surface Is Smoother And More Corrosion Resistant. The Cylinder Block Is Made Of Thickened Precision Steel Pipe, Which Has A Very High Pressure Resistance And Is Not Easily Deformed. Use High Quality Seals, Long Service Life. When We Open The Trunk, It Acts As A Buffer, Which Is More Labor-saving, More Convenient, And Increases The Comfort Of Use. Fit For Tesla Model 3 Trunk Loading Grade: Medium Load, Model: Tm 25*40 Die Springs For Die Machinery Or Other Applications. Description:rectangular Section, Closed-end Design. Die Springs Are Primarily Used In Die Machinery, For Plastic . The Loading Grade Of Die Springs In Various Colors (from Lightest Load To Extra Heavy Load): Yellow, Blue, Red, Green, Brown. In Addition, Because Die Springs Are Well Suited For High Stress Applications, They Are Also Suitable For A Variety Of Other Applications As Well. Colour:red Material:metal Spring Sizes: 25mm / 1-inch Outer Diameter 13mm / 0.5-inch