The cutting edge in French horn case design!

The MB-5 Flex is the latest variation on the extremely popular MB-5 line. It is approximately one inch larger than the MB-5 Baby cases so that it fits nearly any horn, including Yamahas. But it is still compact and airline-friendly. And with the entire horn surrounded with a hard fiberglass shell, it is prepared for whatever bumps it may encounter on the road.

Marcus Bonna conducted extensive research on larger horns when designing the Flex case, so it even fits wide-bodied Hoyer G10s, taller-bell Yamahas, and many triple horns! Pictured: a Hoyer G10 fits perfectly! But please don't hesitate to contact us if you have questions about the fit.

Marcus Bonna has an awesome new tool here that lets you design your own MB-5 Flex online! Once you're happy with the design, follow the instructions on this page to place the special order with us, and you'll have your own custom-made case.

WARNING: Brass instruments and their accessories can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm, and Nickel, which is known to the State of California to cause cancer. For more information go to:

www.P65Warnings.ca.gov

Most new instruments and accessories over $75 are eligible for free shipping to the continental US.

Thein instruments, tubas, and pre-owned instruments are excluded from free shipping.

Click here for our full shipping policy.

Most products sold in the United States receive a 15-day return policy that starts on the day the customer receives their order. The customer is responsible for the cost of initial and return shipping, except in the case of new French horns, trumpets, and trombones, which will receive free return shipping from 48 US states. There will be a $5 cleaning fee for each returned mouthpiece.

Some product categories are ineligible for return, which include special orders, sheet music, consumables such as lubricants or cleaning snakes, and personal items such as clothing or face masks.

Unfortunately, as of May 12, 2025, we can no longer offer returns, exchanges, or refunds to international customers due to the tariff situation. We hope to restore international returns soon.

See the policy links at the bottom of our website for more information.

Click here to request a return.

Any product labelled "Special Order" is a final sale, no refunds or exchanges. Likewise, any product that has been customized at the customer's request can no longer be returned.

Click here for more information on special orders. If you want it, we will try our best to get it to you!