Made from 100% durable polycarbonate with texture.Integrated TSA lock allowing to close off both compartments seperately for added security.Hidden expandability on spinner 55 Expandable, 69, 75 and 81.Check-in models are fully lined and feature a roll up divider pad, multiple pockets, smart fix system and height adjustable cross ribbons. Separate main compartment contains large mesh pocket in the Top and cross ribbons in the bottom.Number of wheels: 4