Images: Callaway Big Bertha irons

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