JK (Josef Klier)

4FM

One PieceM-Series
Official source link providedPrice basis: RetailerLast checked: Jan 29, 2026

Specifications

Cup Diameter
16.50mm
16.50mm18.50mm
vs. All Models
9% · Small
Cup Depth
Shallow
Cup Shape
bowl
Bore Size
3.80mm
3.80mm4.80mm
vs. All Models
4% · Small
Rim Shape
Flat
Recommended For
All AroundHigh HornChamberBright Tone
View on official site

Other Brand Similar Specs

Spec proximity does not guarantee actual feel or tone. Trying before purchase is recommended.
Alexander 4Medium Similarity
Cup Diameter: SameBore: -0.10mmCup shape data unavailable
Specs used: 4 / missing: 1
Osmun H (Haydn)Medium Similarity
Cup Diameter: +0.01mmBore: +0.70mmCup shape data unavailable
Specs used: 4 / missing: 1
Osmun B (Bloom)Low Similarity
Cup Diameter: +0.01mmBore: +1.00mmCup Depth: shallow → medium shallowCup shape data unavailable
Specs used: 4 / missing: 1
Bach 12Low Similarity
Cup Diameter: SameBore: +0.70mmCup Depth: shallow → mediumCup shape data unavailable
Specs used: 4 / missing: 1
Osmun CH (Chicago)Low Similarity
Cup Diameter: +0.01mmBore: +0.82mmCup Depth: shallow → mediumCup shape data unavailable
Specs used: 4 / missing: 1
Osmun One-Piece ChicagoLow Similarity
Cup Diameter: +0.01mmBore: +0.82mmCup Depth: shallow → mediumCup shape data unavailable
Specs used: 4 / missing: 1
Osmun One-Piece LondonLow Similarity
Cup Diameter: +0.01mmBore: +0.82mmCup Depth: shallow → mediumCup shape data unavailable
Specs used: 4 / missing: 1

Other Models by JK (Josef Klier)

01AKK-Series18.50mm · Very Deep · 4.80mm01BKK-Series18.50mm · Deep · 4.60mm01CKK-Series18.50mm · Medium Deep · 4.40mm01DKK-Series18.50mm · Medium · 4.20mm01EKK-Series18.50mm · Medium Shallow · 4.00mm

Where to Find

View on Official Sitejk-klier.de
Search on GoogleGoogle Search

This site does not sell mouthpieces. Links are provided for reference only. Please verify prices and availability directly with retailers.