2011 best sellling 4 wheels luggage bag 1.material;nylon 2size:20 24 28 3. ... design 4.Strict quality control:ISO900 2011 best sellling 4 wheels luggage bagFeatures :outer materials: polyester 1680D ,that is the top ... about 50kg s pressure ,well-designed , more durable . Wheels : use high quality PVC wheels, stainless steel axletree make it more bearing ,rolling ...