This nylon coil sleeve is the most commonly used length on all brands of pinball machines.
Typically found on pop bumpers, slingshots, kickers, and early solid state and electromechanical flipper assemblies.
The least expensive way to perk up your sluggish machine is to replace all of your coil sleeves.

Reference Part Numbers:
Williams/Bally 03-7066.
Stern/Sega/Data East 545-5411-00.
Jersey Jack Pinball reference #30-000014-28.
American Pinball reference #PLS0035-00.