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Storm IQ Tour 78U is the latest launch in the line of IQ Tour of storm bowling balls. The newest Master™ Line offering is the IQ™ TOUR 78/U. As of January 1, 2024 all urethane balls used in the PBA must have a Shore D hardness of 78 as a standard. the chemists of Storm went right to work developing the ultimate in urethane performance at this new standard.