ABS/PC material, all sizes with expander, Iron trolley system with push botton, matt gun tube, with 8wheels, Insert TSA lock on each case, 20“ only with top handle, 24"/28" with top and side handle, 20" no side feet, 24/28" with side feet, Inside full lining, no foam backing, with one "U" shape pocket+mesh pocket, with hanging pocket+ clothing straps in the main compartmnet, with middle zipper, black components. Size: 20"/24"/28"