How to use: First, measure your wind instrument's bell size to make sure this cover fits. Then, simply put the cover over the bell opening and use the elastic closure and cord lock to secure it. During performance, it will work to reduce aerosol spread while having little impact on your playing.
Things to note: These masks have not been tested by official organizations to prevent virus transmission. The MERV - 13 filter should not be washed. Replace it after 1 - 2 months for best performance.
Maintenance: This cover is reusable and can be hand - washed. After washing, let it dry thoroughly before using it again.