T.R.U. BALL RELEASE FANG 4HAND HELD 4-FINGER THUMB BLACKFEATURES:-Hook style jaw that allows the archer to push the slide forward to lock the release on the D-loop-Provides the ability to shoot w/ no sensitivity spring for the lightest possible setting or a medium & heavyspring, included in the package-Adjustable thumb barrel positions can be attained w the large knurled thumb peg & teardrop