Cavity Back Irons
A cavity back iron produces great consistency and control on shots for the golfer looking to improve their game. They get their name from the hollowed out rear section of the club head, which looks like a cavity. This is opposed to the more traditional muscle back blade, where the back of the club head is a solid face as well.
It's due to this basic difference that cavity backs are able to provide a great deal of forgiveness on strokes.
The original cavity back club was invented by Karsten Ping and was actually a putter! It took until 1961 for Karsten to introduce his revolutionary perimeter weighting idea onto an iron, and by the 1980s, almost all club manufacturers had their own set of cavity backs available.
Why is a cavity back more forgiving? Physics. A hollowed out club head moves the majority of its weight to the edges. This means a larger sweet spot across the face of the club, and also with a bit of clever design, a thicker sole for a lower centre of gravity. The thicker sole also helps level a club on impact with the ground - whereas a thin blade would cut through the surface and remove a large divot, the thicker cavity back is more likely to glide along the surface and launch the ball.
Cavity backs are considered a game improvement iron, but their regular use by tour pros is testament to their relevance to all golfers. With the technology available in club head manufacturing, the decision for pros to play with cavity or muscle back irons comes down to personal preference.
PGE's philosophy in club head manufacturing is that no shortcuts should be taken. It's for this reason that all of our Peter Thomson irons use single forged heads, giving better feel and response to the golfer. This also applies to the PT cavity back. All golfers from tour pro to the high handicapper deserve to experience the flush feel of a truly single forged golf club.