Gator Cases Wind Instrument Bell Cover, Merv 13 Replacement Filter, 18-19",Black

To place the cover on the instrument bell, it is recommend that you first tighten the elastic drawstring to create a lip. Then slide the cover over the instrument bell using the lip to keep the cover in place. You can then center the cover more, and tighten the elastic drawstring to keep it in place. For a visual representation of this, please see the instructional video located above with the main product photos.FeaturesMerv-13 FilterGreatly reduce the spread of aerosols and made to meet performing arts aerosol study recommendations.Elastic Closure and Adjustable DrawstringElastic closure and adjustable drawstring with cord lock keeps the mask secured to the bell of your instrument.Little to No Back Pressure from CoverBreathable design with little to no back pressure or acoustic loss during performance.Gator Cases Double-Layer Aerosol Cover for Band Instruments; Fits Bell Sizes Ranging from 18 to 19"The wind instrument double-layer bell covers fit securely over the bell opening of your instrument to help reduce the spread of aerosols during use. These covers come equipped with a removable Merv-13 filter and are designed to meet the recommendations set forth by the Performing Arts Aerosol Study commissioned by the National Federation of State High School Association (NFHS).Each cover features an elastic closure and cord lock that allows you to tighten it over your bell cover for a snug fit and does not cause any back pressure or noticeable acoustic loss during performances. To clean, simply hand wash and let air dry (do not machine wash). To assure best fit, be sure to measure the bell diameter of your instrument prior to ordering.