Selling PointCompatibility: die springs fit for most 3D printer bed, die machinery or other applications, perfect for 3D printer Ender 3 heat bed springs. Feature: strong and sturdy, rectangular Section, and keeps 3D printer bed level better. Loading Grade: Light Load, Model: TF 8mm*20mm, Color: Yellow Size: 0.31in/8mm (OD), 0.19in/5mm (ID), 0.78in/20mm (Free Length) Package Included: 10 pcs x Die SpringsCompatibility:Die springs fit for most 3D printer bed, die machinery or other applications, perfect for 3D printer Ender 3 heat bed springs. Of all the mold springs in color, yellow is the one with the lightest load. However, since die springs are well suited for high stress applications, they are also suitable for a variety of other applications as well.Please feel free to contact us if any problems, our customer service team will reply to you at the first time.