These capos work like a charm. Whether you are rockin out in Madison Square Gardens with Poison or if you are at grandma's house singing songs to your cousins. You won't miss a key change in between songs!These capos are easy to use and very fast to change! A perfect fit for the necks and fingerboards of acoustic 6-string guitars, the original Quick-Change is a snap to reposition between frets using just one hand, or to "park" on the head stock.