SKB iSeries Case is molded from a proprietary blend of ultra-high-strength polypropylene copolymer resin that makes them both lighter and 2.8x stronger than the competition. The SKB Cases iSeries Zoom PodTrak P4 Case features a high-quality foam interior that has been form-cut to fit the Zoom PodTrak P4 with a pocket below to store the USB charging cable and other small accessories. The SKB iSeries Injection Molded Mil-Standard Waterproof Case is molded of ultra-high-strength polypropylene copolymer resin, featuring a gasket-sealed, water and dust-tight, submersible design that is resistant to corrosion and impact damage.