Specially design for YAMAHA or SELMER instrument users to improve the resonance between the right and left side. It designed for professional level musician aiming to achieve more steady and accurate overtone register as well as to enhance the sympathetic response of the saturation of overtone at the full register. 
It also helps to increase accuracy and readability and reacting speed while playing fast articulation music.

It available in  SILVER platted. It does not require installation on the instrument. The player needs to lock the counterweight screws into sides of  the orinigal connecting unit between the instrument and neck, adjust both the hook to make the saxophone fixed in the most comfortable angle.