SKB 3I0907-4-SWK iSeries Injection Molded Case for Sennheiser SW Wireless Mic Series Designed with a custom interior to fit the Sennheiser SW Wireless System Ultra high-strength polypropylene copolymer resin UV, solvent, corrosion and fungus resistant (MIL-STD-810F) Complete gasket seal makes these cases absolutely watertight (MIL-STD-C-4150J) Patent pending "trigger release" latch system