Rectangular Section, strong, keeps print bed level betterDie Spring: compatible with most 3D Printer Heated Bed, great Ender 3, Ender 3 pro heat bed springs, flat top and stifferEnder 3 CR-10S CR-10 Compression Springs M3 Screw Light Load Bottom Connect Leveling 3D Printer Heat Bed SpringsDie springs are primarily used in die machinery. compatible with die springs, yellow color here represents that the loading grade is light load.However, because die springs are well suited compatible with high stress applications, they are also suitable compatible with a variety of other applications.Loading Grade: Light LoadColour: yellowMaterial: metalSize: 20x8x4mmPackage Contents:20 x 3D Printer Heat Bed Leveling SpringOnly the above package content, other products are not included.Note: Light shooting 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.