New, unused Fender USA genuine tremolo arm tension spring. Inserting this into the arm hole of the tremolo block reduces looseness and play, allowing you to eliminate arm wobble and hold the arm in a non-obstructive position. Compatible models: American/AM Vintage/AM Standard/Classic/Deluxe/Road Worn series ST, etc. Size: Length: Approximately 12mm Diameter: Approximately 3.7mm There are no smokers or pets, but please understand that this item is stored by an individual. Also, since this item is also sold on other sites, please check for availability before purchasing. Please refrain from price negotiations. Thank you.