These polished BLACK HAMMER'S crafted by FABALL where polished using a unique machine made especially made for Faball. This polish cannot be replicated by another machine or by hand. This was a premium at the time when Faball was manufacturing bowling balls. Black Hammer is the original hard hitter. This high quality ball pioneered two piece urethane bowling balls and started the Hammer WINNING Tradition. Ideal for medium to oily lanes.