Seyberts Radial Black Collar S-Tuned Z-3 Predator Shaft S-Tuned Predator Z-3 with Pro Taper shafts. Our S-Tuned Z-3 shaft is an 11.75mm custom-built shaft based on a Predator Z-3 partial is modified for the player that would like a smaller diameter high performance shaft with a pro style taper that goes 12 inches straight back. This new taper paired with Predator ‘s new 3rd generation V-Tek construction creates a stronger and lighter front end for reduced deflection and pinpoint accuracy.