Description from Thomann : The "MACK" is an embouchure trainer for optimal control of the air flow. It is a further development of the BERP and has its all benefits. With the "MACK" the original distance between the mouthpiece and the instrument is maintained and will not be extended as with the BERP. The "MACK" can also be used together with the BERP. Note: Does not fit Breslmair mouthpieces!
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