Blending the best of blade and mallet designs, the Ai-DUAL Double Wide 1/2 Ball DB Putter offers a wider profile for added stability and Odyssey's innovative 1/2 Ball alignment for pinpoint accuracy. Its double-bend hosel keeps the face square through impact, while the Ai-DUAL insert ensures speed and feel you can trust. Odyssey's new line of Ai-DUAL putters feature their latest and greatest Ai-DUAL insert which delivers speed consistency across the face, incredible forward roll up and down the face, and amazing feel. Ai-DUAL Insert Designed using Artificial Intelligence, this dual-layer urethane insert has a soft outer layer and a firm inner layer delivering not only consistent ball speed across the face, but also enhanced forward roll up and down the face and amazing feel New FRD Groove This new Forward Roll Design Groove is deeper and more aggressive. With a 19deg slope it works in conjunction with the dual layer design to improve forward roll up and down the face 1/2 Ball Alignment Option Odyssey's next revolutionary alignment technology, the 1/2 Ball design frames the ball helping to center your impacts and improve your aim. SL 90 Shaft The standard length putters come with a lightweight steel shaft with 20-30 grams (depending on the grip) of counterbalance weight in the butt end. Odyssey's testing consistently shows that players strokes are more consistent with this configuration