This British-made 100% cotton bell cover fits tubas with a 19” bell diameter, such as the Besson E♭ and BB♭ tubas, comfortably. It also works perfectly for smaller tubas, including 17½” bell instruments such as the Yamaha YFB-822 F and all 17” bell tubas. It is very easy to put on and take off and has only a very slight effect on the sound. A great way of helping reduce the risk of spreading harmful aerosols and droplets. Essential for all the school bands during the COVID-19 pandemic. Made by a traditional Northern textile business for Alliance Brass.