The "KR Indigo MAX" (Height 3.5"/88.9mm, Outer diameter 5.145"/130.7mm, Inner lip diameter 4.21"/106.9mm) is slightly deeper and wider on the outside than the "KR Indigo", providing the ultimate in plunger sound and intonation. Works great on standard bell size trumpets (for example the Bach 37) as well as larger bell trumpets.
The "KR Indigo" model is for players that prefer a more traditionally sized plunger or have a shorter reach. Height 3.375"/85.7mm, Outer diameter 4.81"/122.2mm, Inner lip diameter (same as MAX) 4.21"/106.9mm.
