New, unused Fender USA genuine tremolo arm tension spring. Inserting this into the arm hole of the tremolo block reduces looseness and play, eliminating arm wobble and allowing you to 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 Please note that this item has been stored by a non-smoker and in a pet-free environment, but it is a personal storage item, so please understand. Also, since this item is also for sale on other sites, please check the stock before purchasing. Please refrain from price negotiations. Thank you.