Introduced in the UK in 2006, the Callie-F is a traditionally styled cavity back putter formed from one piece of forged manganese-bronze. The C-Grooves are precision cut into the face to reveal Golden Colour Grooves.

Early roll means less deflection and a straighter line.
By gripping the back of the ball and lifting it forward on impact, the C-Grooves of a Yes putter create almost instant stabilization, causing the ball to roll forward much sooner than any other putter. In fact, as much as six times sooner.

Balls struck with the Yes! C-Grooves invariably achieved forward roll within 3" to 4" while balls struck by competitive putters repeatedly skidded, skipped and spun before settling into forward roll in approximately 18 inches.
And the sooner a ball achieves smooth forward roll, the better the line it will have and the less likely it is to be affected by aberrations in the green. In short, more putts will drop in.
Even when struck up to a quarter of an inch off center, the C-Groove putter rolls the ball sooner and more consistently.

Perhaps the best endorsement is the fact that over 200 touring pros now use Yes! putters.