Predator Z-3 5/16 x 14 Black Collar thread pool cue shaft. The Predator Z-3 high-performance cue shaft is lean, mean, and has the most flex of all Predator Shafts. Its smaller diameter paired with V-Tek construction allows for an extremely light front-end and pin-point tip placement. The all-new Predator Z-3 is also 4% lighter at the front-end than the previous generation shaft and is considerably stronger.