The Trigger Fly Capo elevates Dunlop's original Trigger design with modern ergonomics for comfort and aesthetics along with enhanced performance thanks to increased sustain and even better intonation up and down the neck. This model features a flat-radius design with a custom low-tension spring that works perfectly with nylon string classical guitars, flamenco guitars, and similar instruments. Change keys on the fly while maintaining the resonance and sustain of your instrument without needing to retune.