Some images of the new Callaway Big Bertha irons, which come with 360 face cup technology for explosive distance
Callaway has unveiled it's new Big Bertha irons, which are designed to offer explosive distance to players of all abilities.
This is achieved through pioneering 360 face cup technology - the first time a face cup, previously used on fairways and hybrids, has been employed in an iron.
The new innovation on the Big Bertha irons has enabled Callaway engineers to create a thinner, and more explosive face.
The hollow-body construction has been combined with variable face thickness to create higher ball speeds all over the face.
Callaway says these developments means its new range of irons is two clubs longer than previous models.
Big Bertha irons have a two-piece construction, with both components forged from 17-4 stainless steel.
A new treatment process has also been utilised to improve the strength of the face - a much-needed development given it's now thinner and more flexible.
The centre of gravity is low and forward, facilitating maximum ball speed and a high moment of inertia.
Callaway has also intoroduced a new Big Bertha hybrid
Callaway Big Bertha irons images:
Callaway says its new Big Bertha irons are two clubs longer than previous models
The 360 face cup technology means the face can be made thinner and more springy for explosive distance
The variable thickness face also delivers 3mph more ball speed from the centre and a 2.5mph on off-centre hits, as compared to previous models
The Big Bertha irons are available in two different shaft options - True Temper Speed Step BO and a new UST Recoil Graphite
The seven-club steel-shaft set comes with an RRP of £699, with the graphite version costing £899
Nick Bonfield joined Golf Monthly in 2012 after graduating from Exeter University and earning an NCTJ-accredited journalism diploma from News Associates in Wimbledon. He is responsible for managing production of the magazine, sub-editing, commissioning and feature writing. Most of his online work is opinion-based and typically centres around the Majors and significant events in the global golfing calendar. Nick has been an avid golf fan since the age of ten and became obsessed with the professional game after watching Mike Weir and Shaun Micheel win The Masters and PGA Championship respectively in 2003. In his time with Golf Monthly, he's interviewed the likes of Rory McIlroy, Justin Rose, Jose Maria Olazabal, Henrik Stenson, Padraig Harrington, Lee Westwood and Billy Horschel and has ghost-written columns for Westwood, Wayne Riley, Matthew Southgate, Chris Wood and Eddie Pepperell. Nick is a 12-handicap golfer and his favourite courses include Old Head, Sunningdale New, Penha Longha, Valderrama and Bearwood Lakes. If you have a feature pitch for Nick, please email firstname.lastname@example.org with 'Pitch' in the subject line. Nick is currently playing: Driver: TaylorMade M1 Fairway wood: TaylorMade RBZ Stage 2 Hybrid: Ping Crossover Irons (4-9): Nike Vapor Speed Wedges: Cleveland CBX Full Face, 56˚, Titleist Vokey SM4, 60˚ Putter: testing in progress! Ball: TaylorMade TP5x
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