Designed by Shinji Hamanaga, Japan.
Shinji was engaged at Yamaha for many years where he designed and participated in the development of many projects. One in particular is the world renowned "Silent Brass". "Warm Up"for Trumpet is Shinji latest invention. 

LIGHT WEIGHT 
COMPACT (able to setup in the bell)
WELL BALANCED SOUND (Pitch / Intonation / Blow Feeling)
SILENCE (Nominal level:about -30dB)
You can warm up at anytime! Anywhere!
FIT TIGHT to the bell
SIMPLE CONSTRUCTION

I wanted to thank you for the opportunity to test your new trumpet practice mute, which Elliot Chasanov presented to my colleague Michael Ewald and me.  I am very impressed with its playing characteristics; it seems to have no wolf tones in the lower register.  It very well may be the best practice mute I have ever tried.  Its compact size and light weight are bonuses.

Most Sincerely,
Ronald Romm
Ronald Romm, Trumpet Solo Artist
Founding and Former Member of Canadian Brass
Yamaha Performing Artist and Clinician
Ronald and Avis Romm Trumpet and Piano Duo