The 3-piece set Luggage Introduction- The 3-piece set includes a 20-inch suitcase, a handbag that can be expanded 10cm vertically, and a small cosmetic bag. 20 inches is the size of the checked luggage approved by the airline for business trips.The 6-piece set Luggage Introduction - The 6-piece set includes 4 suitcases of 16/20/24/28 inches, a handbag that can be expanded 10cm vertically, and a small cosmetic bag. The 20-inch suitcase size is approved by airlines for business trips.360° Universal Wheels and Handles- Each suitcase is equipped with 4 silent universal wheels that can rotate 360°. The new soft TPU and lubricated balls inside the wheels make the suitcase move smoothly and absorb shock.TSA Lock and Shark Tooth Zipper- The travel luggage is equipped with a TSA-certified lock, as well as a reinforced upgraded shark tooth zipper to prevent the suitcase from bursting and protect personal items.High-quality hard shell material- The hard case luggage is made of scratch-resistant ABS+PC composite material to provide hard and wear-resistant shell protection.Other high-quality details- There are rubber handles on the top and sides of the suit case, which is convenient for carrying the suitcase when going up and down stairs. There are 4 side feet on the side of the suitcase, which can be used to hang your bag or protect the shell when lying on the side of the suitcase.PlainABS