The Evolution is a fully adjustable triggerless back tension release that works by pulling through an amount of poundage greater than your holding weight at full draw. Simply attach the Evolution to your loop, hold in on the safety and draw to your anchor. Let off the safety and continue to pull past your holding weight and experience the cleanest surprise release you've ever felt. The Evolution requires no rotation adn is fully adjustable to your individual bows holding weight. Our revolutionary safety system completely eliminates the chance of misfires while drawing. The short distance between the finger grooves and the jaw will not take away any precious draw length. The newly incorporated interchangeable Tension System allows you to change the adjustment spring to customize your Evolution to your individual bow set-up without taking the release apart to change springs. NOW...the Mini Evolution has a finger that is .8 in diameter! Carter Releases Mini Evolution.