Mod Kits available for nearly every make and model brass instrument
30 years of research in one package
Flexibility to play seamless wide intervals
Slotting increases accuracy
Stability in all registers at any dynamic
how does it work?
Jason Harrelson, founder of Harrelson Trumpets, discovered something revolutionary while playing his friend's Bach Strad back in 1992. Want to know the rest of the story?
Adding Efficiency with mass?
Have you heard that adding mass will darken the tone? Or that heavy bottom caps reduce flexibility? Both of these myths have been proven to be untrue in numerous experiments and you can learn why here.
What to expect
SWE Mod Kits reduce energy loss in the sound wave, thus increasing efficiency. This translates to playing with less effort, improved attacks, flexibility, slotting, endurance and dynamics.
Will it fit?
All Harrelson Mod Kits are guaranteed to fit your specific horn. We offer a full money back guarantee and/or exchange on all Mod Kits that do not fit your instrument perfectly. All Mod Kit sales are final unless otherwise specified.