Eachine1 10pcs Spring For 3d Printer Extruder Heated Bed Ultimaker Makerbot

10pcs Spring For 3D Printer Extruder Heated Bed Ultimaker Makerbot Features: Super elastic On the surface of nickel plating processing, have better corrosion resistance, and surface hardness The wire diameter: 1.2mm Inner diameter: 5mm Outside diameter 7.5mm Height: 20mm Material: stainless steel circle number: 9 Package included: 10 x Spring