Mizuno CLK HybridMizuno CLK Hybrid The CLK Hybrid by Mizuno is constructed with a super strong, multi thickness, maraging steel face. This material increases energy across the entire hitting area. CORTECH Design optimizes the face thickness to maximize the COR, and wave technology adds more rebound at impact to produce extremely high ball speeds. Finely tuned shape and geometry called Harmonic Impact Technology, delivers ideal feel, feedback, and sound. A Quick Switch