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Forged 660

  - Titleist
Introduced in 2006, the 660 irons were forged from 1025 mild carbon steel and featured a concave muscle back design. Swing-weight was D2.

2-iron: 19° loft, 0.140" offset
3-iron: 22°, 0.135"
4-iron: 25°, 0.130"
5-iron: 28°, 0.125"
6-iron: 32°, 0.120"
7-iron: 36°, 0.110"
8-iron: 40°, 0.100"
9-iron: 44°, 0.090"
PW: 48°, 0.085"