The CG15 has the firm's "zip grooves," plus a laser-milled clubface treatment that provides rough texture between each groove. This combination creates maximum spin under the Rules of Golf. The "S-shaped" sole is slightly narrower in the heel and offers plenty of toe relief. CG15 comes in three finishes: Satin chrome, "Oil Quench" or Black Pearl. (A companion model, the CG15 Tour, has "condition of competition" grooves.)