with the highest attention to detail, this hand-made instrument by Polish master builder Roman Koc provides exceptional playability, powerful sound and beautiful looks

east indian rosewood fingerboard

with 20 frets and mother of pearl dots


tortoise pickguard for the vintage look

active electronics with two delano sbc humbackers, black hardware from goth and ets, 24 frets with easy access

Body: mahagony


Top : Walnut


Neck: 3 piece Walnut


Width: nut 40mm; 24 fret 63mm


Thickness: I – 20; XII – 23mm


Fingerboard: ebony


Head: angled


Machine heads: Gotoh GB 7 black


Nut: ebony


Scale length: 34”

Radius: 14”


Number of frets: 24”


Pickups: Delano SBC humbuckers


Controls: Volume- 1 Balance- 1 DELANO 3-way EQ


Bridge: ETS


Strings: Daddario


Hardware colour: black


Finish: high polish


Colour: natural

just like any other instrument from GMR, this bass can be custom-built according to your wishes (woods, hardware, pickups, string spacing, electronics, etc.). please contact us to make an appointment and try a similar instrument.

gmr flow-out 4 walnut

condition new

availability sold

gigbag included

shipping in Switzerland included


Alfred Escher Strasse 25, 8002 Zürich

tel +41 79 824 73 82