Make your riffs spring to life. And do it with world renowned quality. The prs core tremolo springs set of 4 are designed specifically for all us made prs models with a tremolo bridge. So if your prs has worn out trem springs these are the ultimate replacement. Authentic distinctive world class. These core tremolo springs provide durability with the quality you can rely on night after night.made with premium materials the prs tremolo strings offer strong tension and powerful return capacity ensuring you can always make the most out of your tremolo bridge. And theyre easy to install too giving you more time to get back to performing your way. So expect to deliver with unmistakable impact and unleash daring whammy acrobatics in no time with these core tremolo springs.