I just purchased this ball a few days ago...it was listed as a 16, but after throwing a game or 2 with it and leaving about 15 or 16 10 pins, not to mention how much lighter the ball felt, I had it weighed and it turned out to be a 15, so it is of no use to me. 2" pin, drilled stacked, span is about 4.5"...if anyones interested, feel free to make some offers.