Traveler&rsquo;s Choice Barcelona 100% Polycarbonate Durable Hardshell Expandable Front Opening Dual Cyclone Wheels 22-inch Carry-On Spinner Luggage Suitcase, Gray The push-button mechanism and multi-stage locking feature allows you to adjust the height of the handle to maximize comfort Patent-pending dual cyclone spherical spinner wheel system provides wide wheel base for better traction and stability The wheels features a 5mm shock-resistant materials that assure smooth maneuverability and quiet rolling experience Each half of the dual cyclone wheel can move independently in the same or opposite direction, allowing you to roll or spin your suitcase effortlessly over uneven and smooth surfaces Expansion gusset increases packing capacity by 25%