Hybrid cut-on-contact expandable that is spin-stabilized for maximum accuracy. Features a huge 2-3/8" cutting surface with 1-1/2" deployable blades and a 7/8" main blade. No kinetic energy loss or deflections upon blade-opening, and the patented Inertia Trigger Cam™ eliminates the need for rubber bands or O-rings. Teflon coated blades for friction-free performance. 1-1/2" cutting diameter. Each pack includes three Turbine Tip practice heads.