Protective sleeves have been used by players like Jeff Beck and SRV to protect the strings inside the bridge block and at the bridge plate. The kit includes 7 tough, yet pliable, poly-vinyl-chloride sleeves in 3 diameters with illustrated step-by-step instructions. String Sleeves protect the strings from nuisance breakage while not affecting tone or sustain. Created for "through-the-body" style guitars.