Product Description 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