972 retro version of all aluminum magnesium alloy, bouncing all-aluminum trolley, zp new one-piece standard logo, inside the hinge wheels unified M logo, high-end hard oxidation more advanced than anodized to make the box more hard, 50 degrees rubber tires to make the gimbal wheels more silent, stainless steel nails sunshine and rain won't rust, mirror sense of Tsa International Customs locks through the network of the international smooth and unimpeded!