Two numbers are worth noting 12 and 14. Previously, Rossa models featured 12 milled face grooves. The classically appointed, stainless steel Daytona #1 has 14 grooves packed closer together. TaylorMade techies believe that orienting grooves in this manner puts more positive spin (less backspin) on the ball for a truer roll. The actual grooves are filled with polymer to soften feel.