Fender USA Genuine Parts American Series Strat Tremolo Arm Tension Springs - Set of 2 These springs are inserted into the tremolo arm hole of the tremolo block to reduce looseness and play. They are very simple, but very effective parts. I've installed them on all of my Stratocasters. The product is only the springs; the guitar in the image is not included. #Fender #Fender #Stratocaster #ArmFixing