Product Description The NFL White Marble spare ball is designed with the team logo created to look embossed against the finely grained white marble printed background. Show off your team pride with this officially licensed bowling ball. NFL spare balls are polyester and are available in 8, 10, 12, 14, 15 & 16 lbs.Color: Multi *Please note that colors may slightly vary from image shownCoverstock: PolyesterWeight Block: Traditional 3-PieceFactory Finish: High Gloss PolishFlare Potential: 1″ (Low)Radius of Gyration (RG): HighDifferential (Diff): LowIntermediate Differential (Mass Bias): 0.000