Thein Brass handcrafts trumpets, trombones, and other brass instruments in Bremen, Germany. Most models are offered with a wide range of bells, leadpipes, metals, and finishes, so players can tailor the instrument to their sound.

The Universal I is Thein's light, flexible tenor trombone, with a focused feel and an even response and sound from the lowest to the highest register.

It has a Hagmann valve, a .547" nickel silver handslide, and Thein's hand-forged Super Sound water key. This example has an upgraded gold brass bell with a cut bell. The bell system and leadpipe are both changeable. Thein offers the Universal I with its C 15.5 leadpipe for a European sound and its S1L or S1L* for an open, focused sound. See the Thein leadpipe guide to compare them. The tuning slide carries Thein's Universal I balancer. Thein recommends its P mouthpiece, and the Thein mouthpiece guide covers the rest of the lineup.

• Key: Bb/F
• Valve: Hagmann
• Bell: 8-1/2" (215 mm) gold brass, French rim, cut bell
• Bell system: Changeable
• Wall thickness: 0.018" (0.45 mm)
• Tuning slide: Yellow brass, with Universal I balancer
• Handslide: .547" (13.9 mm) nickel silver
• Water key: Super Sound, hand-forged
• Leadpipe: Changeable
• Finish: Lacquer
• Recommended mouthpiece: Thein P (not included)

Every new instrument comes with the Houghton Horns New Instrument Warranty, which covers defects in material and workmanship for two years.

Not sure which setup is right for you? Book a free virtual instrument consultation with our team.

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!