SKB's i-Series injection moulded waterproof cases are constructed of ultra high-strength polypropylene copolymer resin with a gasketed, waterproof, submersible design that is resistant to corrosion and impact damage. Their military grade design features a continuous moulded-in hinge, patented "trigger release" latch system, TSA accepted and approved locks, comfortable, snap-down rubber over-moulded cushion grip handles, secure stacking, and automatic ambient pressure equalization valve. 3i-3614-KBD 49-note keyboard case features a combination foam/cleat interior, which holds the instrument securely during transport. Adhesive backed foam in the lid also secures the keyboard. The case also has wheels for tilt-and-go transport.