Soundsmith Premium Guitar Capo - Designed For Acoustic and Electric Guitar - No Fret Buzz, Smart - Memory Coil Spring Technology, Single Hand Quick - Change, Top - Grade Silicon, Lifetime Alloy Metal SMART-MEMORY COIL SPRING TECHNOLOGY - Heavy duty treated spring that will last! Durable heavy duty zinc alloy material TOP GRADE SILICON designed to apply even pressure across all the strings to eliminate fret buzz while keeping all strings in tune! NO HASSLE GUARANTEE - Don't sacrifice quality for price! Lifetime Free Replacement guarantee EASY GRIP NON-SLIP DESIGN - Moves quick and easily with one hand! SAVE THE MUSIC! - 10% of all proceeds are donated to VH1's Save the Music Foundation (a non profit organization to keep music programs in schools)