Mizuno's Hybrid H.E.M.I. COG design philosophy is utilized in each iron for maximum energy transfer from club head to the ball. In addition to the multiple technologies, the Mizuno MX-950 #3 and #4 hybrids have an amazing two-tone paint finish which fades from black to blue, and the Mizuno MX-950 irons are durable double nickel chrome plated with a brushed satin finish to provide durability and glare resistance, and utilize modified U-grooves to produce the ideal spin rate, for maximum playability in all conditions.