The new Abyss Flex is a brass thumb activated release, that use the same exact handle as the Fulkrum Flex, with the same impact points. The Abyss Flex also uses the same Lever Alignment System (LAS) Technology as the Fulkrum Flex. What does this mean? It means that you don't have to worry about what hinge/back-tension release to choose, you now have one to match in the Fulkrum or Fulkrum Flex. The Abyss Flex has a single sensitivity adjustment screw with a lock that can be adjusted infinitely for your personal feel. Re-tighten the lock after your adjustments are made. New in the Abyss Flex is the comfort flex technology that now allows the archer to select infinite finger locations on both the three finger and four finger handle pieces. Each piece can be individually moved a total of 30 degrees. The Abyss Flex feature a simple locking travel adjustment screw, that allow you to set the travel to your preference quickly and easily. Highly customisable design Precision CNC machined brass construction, for a weighted feel in the hand, with anti-corrosion Quicksilver coating Hardened stainless steel internal components for high quality reliability Aluminium finger pieces featuring micro-adjustment within a 15 degree range to get the perfect and most consistent fit in your hand LAS system allows for multiple head positions to suit your anchor point Micro adjustable set screw with locking feature to adjust trigger sensitivity and separate travel adjustment Pairs perfectly with FulKrum Flex to give options for back tension or trigger shooting without having to change your bow set up Note 4f piece available separately.