SKB 3I-4217-KBD iSeries 40 x 16 x 5 Inches Water-Tight Injection Molded 61-Note Keyboard Case Ultra high-strength polypropylene copolymer resin with patented trigger latch UV, solvent, corrosion and fungus resistant (MIL-STD-810F) Complete gasket seal makes these cases absolutely watertight (MIL-STD-C-4150J) Automatic ambient pressureequalization value (MIL-STD-648C & IP67) Resistant to corrosion and impact damage