TEN IN THE PIT! With the introduction of STORM's exciting new JOLT and JOLT Pearl comes a newly developed and dynamic weight block. Combining the world class ACCU Tread coverstock and innovative multi density weight block ensures a strong, consistent reaction every time. STORM Pro Pin TechnologyBy Storm's Steve KloempkenSTORM's PRO PIN technology is taking layouts and ball reaction to the extreme. Once only used on the PBA Tour for condition specific drillings, these balls are now being made available in limited quantities to the general bowling public. Why As the requests, requirements, and styles of today's bowler changes to address new lane conditions and patterns, STORM is answering by providing and packaging these items separately from the standard first run items due to their unique nature and value.STORM PRO PIN bowling balls areAll first quality STORM bowling ballsManufactured with the same high quality standards as all other STORM productsManufactured with the highest integrityMade with the same high quality materials as all other STORM productsGreat for specialized layouts and drilling optionsPotential for enhancing dynamic use of core positionMeet all A.B.C., U.S.B.C. and P.B.A. regulationsSTORM PRO PIN bowling balls are first quality bowling balls with pin distances over 5 from the center of gravity and top weight between 2 and 4 ounces. Through our testing, we have found that these balls lend themselves to a variety of drilling patterns outside the range of pins less than 5 which would require an extra hole to accomplish with standard pin and top weight specificiations. Based on the desired reaction, some Pro Pin drillings may require an extra hole for balance requirements.Please visit your pro shop professional for assistance in determining the best layout for your style and lane conditions. If additional questions, please consult the PRO PIN Drilling instructions included in every box or call STORM Technical Services at 1 80