The Ai-ONE Armlock #7 SB is an iconic shape and a modern classic with an angular design that makes it very easy to align. This version has a 380 gram head and is built at 42 with an Armlock grip intended to be rested on your forearm. This configuration makes this face balanced putter extremely stable. This putter features our Ai-ONE insert with an aluminum backer and White Hot urethane striking surface and our new SL 140 Stroke Lab steel shaft.