Bass Harpejjis


Semi-Fretless: Half Fretted • Half Glass
Glass + fretted fingerboard Financing available 10-day satisfaction

Note RangeB0 – F#4 (3.5 octaves)
Fretted SectionB0 – F#3
Glass (Fretless) SectionF1 – F#4
StringsLight-gauge flatwounds
Glass Fretboard Section — a smooth, slide-ready playing surface for expressive vibrato, bends, and effortless glissando.
  • Signature semi-fretless design: half glass, half fretted.
  • Includes the major upgrades of the M Series.
  • Extra-long scale for clarity and punch with flatwound strings.
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Bass Harpejji MSF — semi-fretless with glass upper section

Bass Harpejji MSF Note Range

Fretted: B0–F#3 Fretless: F1–F#4

Start Your Bass Harpejji Order


Natural Finishes: Typical build time 60–105 days

Custom Finishes: Typical build time 75–120 days

Questions about an order, paint options, or anything harpejji? Call 1.800.472.2105 or email support@marcodi.com.


Glass Fingerboard


Say hello to the smoothest part of your harpejji—our all-glass fretless zone. Built for glides, bends, and buttery vibrato, this sleek glass surface turns every note into a silky, expressive experience. It’s durable, slick, and looks like it was pulled straight from a sci-fi concert stage. Whether you’re adding subtle textures or diving into full-on fretless solos, this is where feel meets futuristic flair.

M Series Pickup Design


The standard piezo pickups have been completely redesigned to optimize consistent tone across the instrument. The piezo crystals have been reoriented 90 degrees to reduce inharmonic overtones.

Pepperoni Frets + Flat Wounds


Not only do Pepperoni Frets look and sound better, they feel buttery smooth under your fingertips. Pepperoni Frets are made with a proprietary alloy for maximum durability and hardness.