I recently went back to 16# equipment and needed a spare ball. I don't really like 3-piece plastic for this role (was using a Faball Nail 15# before). The Pro Shop gave me a decent price on a "Regency 300 Urethane" ball - a black sanded looking thing without the original box. After he drilled it I was thrilled - it was a 2 piece ball, and judging by what I could see I'd guesstimate that it had a light-bulb looking core. If I had to stake money on it I'd say it was the old urethane Nitro, but I don't believe they came in black. Did Ebonite only put the Regency 300 label on "blem" or "seconds", or did they produce seperate products on the Regency 300 label? One thing I do know - this ball rocks!! Hits like a tank, and does what I like for a spare ball - it slides in the oil and hangs on to the dry boards if you miss a bit right on a ten pin.