Carter Evolution Too 3 Finger Handheld Release - Red - The Evolution Too features Piston Resistance technology which gives you the ability to fine tune your tension adjustment range and offers a level of consistency unmatched by other resistance activated releases. The safety design includes a feature that will not allow the safety to disengage if you are pulling harder than the release is set for. Piston Resistance technology Fine tune tension adjustment Safety design includes a feature that will not allow the safety to disengage if you are pulling harder than the release is set for