Large Bore Trombone: Lightweight Underpart

Pickett Brass Large Bore Trombone Lightweight Underpart

Explore a lighter feel and brighter response while keeping the rim you know. Our lightweight blank feels easier to move than the standard-weight design, offering a different playing feel within the same modular large-bore mouthpiece system.

The underpart forms the cup and shank portion of your mouthpiece. Choose your matching numbered size and preferred cup depth, then pair it with a Pickett brass or acrylic rim. For a secure, solid feel, consider the standard-weight underpart.

Match the rim number to the cup number. Pickett large-bore brass and acrylic rims fit both standard-weight and lightweight large-bore underparts of the same numbered size. For example, pair a size 5 rim with a size 5 underpart, then choose the cup depth you prefer.

Choose Your Size — Inner Diameter:

• 3: 1.044" / 26.52 mm. The largest diameter in this range, for players seeking an open feel and a dark tonal character.
• 4: 1.034" / 26.26 mm. An open feel suited to players seeking breadth, including orchestral second-trombone work.
• 5: 1.024" / 26.01 mm. A balanced option with a centered core across registers.
• 5.5: 1.019" / 25.88 mm. Slightly smaller than the 5 for players seeking added support.
• 6: 1.014" / 25.76 mm. A more compact option for players seeking focus and a dense core.
• 6.5: 1.004" / 25.50 mm. The smallest diameter in this range.

Choose Your Cup Depth:

• D — Deep: Our deepest stock option, designed for a free-blowing feel and a warm, rich low-register sound.
• M — Medium: A versatile middle-depth option for a balance of sound, response, and efficiency across musical settings.
• S — Shallow: A more supportive feel in the middle and upper registers, with added brilliance and efficiency.

Available in silver or gold plating with brushed or polished finishes. This listing is for the underpart; a matching rim is required to complete the mouthpiece.