The New CCM SPEEDBLADE +4.0 Holder is created to provide extreme speed this revolutionary new blade holder increases your turning radius by up to 10% for the most aggressive angle of attack in hockey. SpeedRibs give additional strength & stability. Additional ribs and triangular design increases torsional rigidity for more strength and extreme speed. This holder is only compatible with the CCM Reebok 4.0+ replacement runners. It is not compatible with the E-Pro/E-Blade runners.