4-pc set Hotbed Spring Upgraded Heavy Duty
Compatible with Creality Ender 2, Ender 3, Ender 3 Pro, CR-10, CR-10S, CR-10S Pro, CR-X, CR-10 Mini, CR-20
Th length is 25MM and the diameter is 10MM.
These are the "upgrade to the upgraded" springs not the "upgraded" ones that everyone has used to replace the "stock" silver springs. Once you install these springs you won't have to level very often unless you bumped your printer. You may have to re-adjust the Z-Axis limit switch because the bed is sitting higher with these springs.