Gator GBELLCVR1819BK 18 19" Bell Cover w MERV 13 Filter Inches Black earphone The new Controller Case Phase Frequency:560 608 MHz The new Controller Case Phase is a compact and protective storage solution to hold your Phase Essential DVS Controller and cables lined with a high density foam padded interior and a tough zipper is the perfect complement to your gear when you want a strong Wind Instrument Double Layer Cover for Bell Sizes Ranging from 18 to 19 Inches fits securely over the bell opening of your instrument to help reduce the spread of aerosols during use The GBELLCVR1819BK comes equipped with a removable MERV 13 filter and is designed to meet the recommendations set forth by the Performing Arts Aerosol Study commissioned by the National Federation of State High School Association (NFHS)