Golf World (UK) - - THE BIG TEST - By Derek Mur­ray

Call­away Big Bertha OS Co­bra King OS Ping GMax

A new thin­ner and stronger steel face cre­ates a larger sweet zone with a sole lip to help ball speed on low-face hits. King OS irons are hol­low right through the set, a con­struc­tion that al­lows them to move weight lower and fur­ther back for head sta­bil­ity on off-cen­tre strikes. Tung­sten weight­ing in the toe has moved the club’s CG lower and more cen­tral, aid­ing launch and per­for­mance out of the toe.

COR-Eye tech­nol­ogy en­cour­ages the whole face to flex. The de­sign tar­gets speed and launch, as well as dis­per­sion. A new wider sole al­lows a GC po­si­tion that aids for­give­ness and launch. Its new shape re­mod­els the trail­ing edge to im­prove turf in­ter­ac­tion. Wide sole al­lows a new, deeper Cus­tom Tun­ing Port lo­ca­tion to aid im­pact vi­bra­tion and also moves CG fur­ther back for twist re­sis­tance. Derek Mur­ray is an award-win­ning in­de­pen­dent club fit­ter and a lead­ing ex­pert in golf club tech­nol­ogy. He’s based at ForeGolf at Killeen Cas­tle, Ire­land.

Call­away’s in­ter­nal ‘stand­ing wave’ low­ers weight and aids launch; it’s now tung­sten-loaded to en­hance its ef­fect. Exo-Cage con­struc­tion al­lows Call­away to strip out un­nec­es­sary weight and cre­ate a light, stiff chas­sis that helps the new face cup to work op­ti­mally. A new 360 º cup face means face edges are thin­ner for bet­ter re­ten­tion of en­ergy across the face, im­prov­ing ball speeds across a wider area.

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