New, unused genuine FENDER USA 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 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, this item is also for sale on other sites, so we kindly ask that you confirm availability before purchasing. Please refrain from price negotiations. Thank you for your understanding.