Layout: 60 degrees x 5 1/2" x 25 degrees RG: 2.50" Differential: .053" M/b: .008" Surface: 1500 grit sanded w/ Crown Factory Compound Core shape: Asymmetric The 3D Offset, released earlier this season, has been an excellent hit for Hammer. It brought back one of the most significant releases in bowling history and has been successful on the lanes. One of the most exciting things about the 3D Offset Attack is that it is Hammer’s first release with the new HyperKinetic 22 cover