The new Strike King features a new symmetric core design and new SK13 reactive coverstock to provide a significant improvement in overall ball performance for the Brunswick entry level product line. CoverstockThe SK13 reactive coverstock describes our newest formulation for a low friction coverstock. The benefits of using our SK13 formula allows us to produce a less aggressive reactive coverstock that easily projects down the lane without making the coverstock highly sensitive to the dry and oily parts of the lane. Core The new Strike King symmetrical core features a single density light bulb shape design. This core design promotes skid through the front and mid-lane with flip on the backend. Ball Motion With its High Gloss box finish, the Strike King will provide excellent length with a medium to quick response to friction at the breakpoint. The Strike King is great ball for entry level bowlers, rev dominant and slower ball speed players on light oil conditions.