# While the Mars is a terrific choice for medium-dry conditions, power players and traditionalists alike demand even MORE control and predictability. Control the uncontrollable with our new Grenade! # You know that the coverstock is critical to ball motion, so even when testing on a shorter oil pattern, even a milder version of Sure Grip II with the Photon core was too much. We decided to step it down a notch and go Old School with the new "Retrothane" shell because predictable ball reaction never goes out of style! The Retrothane is a traditional urethane coverstock that will help you tame even the most scorching lane conditions. As witnessed on the PBA Tour and in World Championship events, urethane is still effective today. # With a medium RG (2.58) and medium differential (.040), the Photon core utilized in both the newly released Riot and Dark Star, is the perfect foundation for the new Grenade.
