The D'Addario Drop Tune Pro Capo is made from aircraft-grade aluminum and is designed for use for drop tunings on guitar. The Drop Tune Capo design includes a shorter upper arm and extended lower arm allowing for partial capo application on 6- or 12-string guitars. It can also double as an effective banjo and mandolin capo. The patented micrometer adjustment mechanism allows the player to dial in the exact tension needed for clear ringing notes without excessive force in any position on the neck. This greatly reduces the need to retune your guitar during and after capo use. The sleek aircraft-grade aluminum construction can withstand the toughest playing/touring schedule while adding no additional weight or obstruction to the instrument.