The Stan OnneX Thumb Bow Release is built off the culmination of all the thumb releases that STAN has ever made to give the best and fastest firing mechanism they have ever engineered. Resulting in zero trigger travel and great adjustability for trigger tension from a hair trigger to extremely heavy.FeaturesZero trigger travelTrigger tension adjustability from hair trigger to extremely heavyIncluded2 Thumb Barrel Extensions2 thumb Barrel Sizes3 & 4 Finger Attachments