Features: Push Button Locking internal retractable trolley system, 4 dual spinner 360° silent wheels for effortless mobility with high performance shock absorbing wheels. Suitcases measure: 20: 14.57 x 9.06 x 21.65; 24': 16.93 x 10.24 x 25.59; 28: 19.28 x 11.42 x 29.23.