JK EFL 4
FlugelhornIn Production
Precision Specifications
RIM DIAMETER17 mm
CUP DEPTHDeep
THROAT ∅—
BACKBORE—
SHANKflugelhorn
CUP SHAPEV
Rim Width—
Rim Contour—
Throat Drill #—
Material—
Finish—
Weight—
Recommended For
ClassicalAll Around
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Special Features
- Exclusive
Reference Notes
JK EFL 4 appears in the Flugelhorn catalog section with 17 mm rim, Deep cup, and flugelhorn shank. Database tags list it for Classical and All Around use. Noted features include Exclusive. Use these measurements as a comparison starting point: fit and response still depend on the player, dental structure, instrument receiver, and each manufacturer's measuring method.
Brand Deep Dive
JK · BrassFit Science
JK Guide
Exclusive system, USA-Line, K vs M horn logic, P vs PO low-brass families, and shank decoding.