Travelpro Luggage Platinum Magna 21 Inch Expandable Spinner Suiter, Black, One Size Dual spinner wheel system featuring magnatrac magnetic wheel alignment provides effortless manueverability without the side-drift of conventional spinners Duraframe one piece frame construction for superior lightweight durability on spinners Contour grip provides superior comfort and control, and relieves fatigue on the shoulder, arm, hand and wrist Worry free lifetime warranty Size 21 x 14 x 9