SKB Mixer Accessory (3i1813-7-TMIX) 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) with Automatic ambient pressure equalization value (MIL-STD-648C & IP67) Molded-in hinges, resistant to corrosion and impact damage Removable perforated foam section to accommodate the TouchMix16