The Tri-Action Ukulele Capo use a patented design to reduce the force required to open and close. This allows you to dial-in the perfect clamping tension, while eliminating the need to retune during use. The micrometer tension adjustment applies direct horizontal pressure, assuring uniform clamping tension regardless of neck profile. Built light and durable, the Tri-Action Uke Capo adds negligible weight to your uke, but can still withstand extensive gigging and travel. Designed in collaboration with Ned Steinberger - US Pat. 8,779,262