SKLZ Accelerator Pro - Indoor Putting Green With Ball Return (9 feet x 16.25 Inches) BALL RETURN. Train without interruption using the continuous ball return INDOOR PUTTING GREEN. Upslope at the cup and true-roll surface emulate putts found on actual greens PUTTING CONFIDENCE. Alignment guides at 3, 5, and 7 feet promote consistency in every aspect of your putting motion - squaring the face, back swing, and follow through PREMIUM MAT. True-roll surface simulates real green conditions with a similar stimp reading.Emulates true-roll surface with upslope at the cup and a stimp reading similar to actual greens PORTABLE. 9 feet by 16.25 inch indoor putting green fits in nearly any room or covered patio