We have perfected our hard case luggage collections, with high quality material molded body coveted. To set your personal combination.Please follow these steps: 1.Open the lock ( the original numher is 0-0-0 ). 2.Push the adjusting sheath to direction of the arrow. 3.Turn the figure wheel to the secret code you need. Don't forget the code! 4.Turn the adjusting sheath to primary place. The secret code go into effect. The 6 pieces set includes 16 inches, 20 inches, 24 inches, 28 inches luggages and 1 duffel bag 1 toiletry bag. One set just satisfies all your different travelling needs.