Cobra King F6 Iron Set TECFLO CONSTRUCTION-Multiple construction technologies flow together to create the ultimate progressive irons. Each club in the set is designed to perform differently, optimized for performance to help golfers hit more greens and hit it closer to the pin PROGRESSIVE SPIN TECH-F6 Irons come equipped with V-Grooves on 4-6 irons to reduce spin, U-Grooves on the 7-PW to optimize spin, and Wedge spaced grooves on the GW-SW to produce extra spin for shots around the green SPEED CHANNEL SOLE-An engineered channel positioned on the sole, close to the leading edge of the iron and around the perimeter of the upper back cavity, creates more flex at impact to deliver greater distance through faster ball speeds PREMIUM CHROME PLATING-A new nickel chrome plating combined with a gunmetal PVD coating provides enhanced durability and a confidence inspiring aesthetic look at address T.O.P-An engineered aluminum cap replaces steel on dual cavity hollow irons which frees up 5g of discretionary weight which has been placed low and further back in the head creating a lower CG position for improved launch conditions and ball flight