Features 1、Wide range of applications, this spring is very suitable for most extruder settings of 3D printers. 2、Has a long compression length, the spring force can be fine-tuned, and the performance is good. 3、Each spring can generate up to 1.6 kg of compression force, good elasticity. 4、With a large number, can meet your use and replacement needs, very practically. 5、Great workmanship, perfect replacement for the old one and has a long service life. Specification Item Type: Z‑Axis Platform Support Spring Product Material: Iron Color Classification: Silver white Product Specifications: Wire Diameter: Approx. 1.0mm / 0.04in Outer Diameter: Approx. 9mm / 0.4in Inner Diameter: Approx. 7mm / 0.3in Height: Approx. 22mm / 0.9in Material: Iron (6 circles) Package List 100 x Spring