O-Works #7

The 2017 O-Works #7 is a mallet, per mygolfway.com's category listing for the release, and hagginoaks.com describes it in the same terms, calling it a mallet shape. tgw.com frames the #7 head as a highly popular head design, which places it among the more sought-after shapes in the O-Works run rather than a peripheral entry.

Odyssey built the O-Works line around counterbalancing, and mygolfway.com's description of the line applies that idea directly to the #7: featuring a counterbalance weight, heavier heads and heavier shafts, these models 'quieten' the hands during the stroke, to produce a more consistent stroke. That's a line-wide claim from mygolfway.com rather than a spec unique to the #7, but it's the framework the head was released into.

The #7 also came with a Tank counterpart. hagginoaks.com notes a Tank version available, and mygolfway.com specifies that Tank Technology is also available in the #1 Tank and #7 Tank models, giving golfers additional stability at impact. So the standard #7 and the #7 Tank sat side by side in the 2017 lineup, with the Tank variant built toward added stability at impact and the standard head carrying the popularity tgw.com points to.