Travelers Choice Rome 21" Carry On, Silver,Travelers Choice -- Dropship,TC3900G20" /> Feather lightweight yet extremely durable top grade polycarbonate ABS hard shell Materials for maximum impact resistance The polycarbonate allows the shell to absorb impact by 'flexing' when under heavy pressure The ABS is then added to give the shell greater rigidity so that it will not permanently deform when under pressure but instead 'pop' back up into its original shape Internal retractable aluminum dual-tube telescopic handle with push button system 9x15x20