The 3i-2011-MC12 is a military grade microphone case and made to hold 12 mics plus a cable compartment. It's from the iSeries which is constructed of ultra hight strength polypropylene copolymer resin making it airtight and waterproof. The microphone holes are cut on a protective PE foam to fit most handheld microphones. The interior dimensions measure 20"x 11"x 8" deep with an Unconditional Lifetime Guaranty.