Item Type: Z?Axis Platform Support Spring_x000D_ Product Material: Iron_x000D_ Color Classification: Silver white_x000D_ Product Specifications: _x000D_ Wire Diameter: Approx. 1.0mm / 0.04in_x000D_ Outer Diameter: Approx. 9mm / 0.4in_x000D_ Inner Diameter: Approx. 7mm / 0.3in_x000D_ Height: Approx. 22mm / 0.9in_x000D_ Material: Iron (6 circles) 1Wide range of applications, this spring is very suitable for most extruder settings of 3D printers. 2Has a long compression length, the spring force can be fine-tuned, and the performance is good. 3Each spring can generate up to 1.6 kg of compression force, good elasticity. 4With a large number, can meet your use and replacement needs, very practically. 5Great workmanship, perfect replacement for the old one and has a long service life.100 x Spring