IBAM Bell Covers are available for all brass and woodwind instruments with bells. Designed in an effort to mitigate the spread of respiratory aerosols. IBAM Covers fit snugly to various bell sizes Quick and easy to attach and detach and may be stored in your case You?ll have faith in our product as soon as you see how sensational they look on your instrument. This Durable bell cover includes a ONE YEAR MANUFACTURER WARRANTY Each cover uses industrial strength USA parachute cord which has an average tested breaking strength of 550 pounds! Manufactured with high quality polyester which does not affect the instrument?s intonation or tone quality Teachers love them! Numerous school districts have been purchasing IBAM covers for all students while some districts are asking students to purchase an IBAM Bell Cover on their own. Professional musicians love them for live performances