💎The bell covers meet the recommendations of performing arts aerosol study . | 💎The instrument bell cover ideal for the bell size around 5 inch, fits for Trumpet Alto saxophone Bass Clarinet Cornet | 💎Breathable design with little to no back pressure or acoustic loss during performance. | 💎The package includes 6 bell covers,Using instrument bell covers to keep students & staff safe. | 💎The bell cover is designed with elastic rubber bands,it can be easy on and easy off of instrument bells with no pull tabs.