The Echo Boss Competition acrylic duck call has more top end volume and more bottom end duck and the back pressure allows you to blow longer hail calls with more notes. This duck call transitions well from lower to higher notes enabling callers to make fewer mistakes. With more than 200 sanctioned titles this duck call's success speaks for itself! Single Reed Echo Boss Competition Acrylic Duck Call Features Greater top end volume Back pressure allows you to blow longer hail calls Transitions well from lower to higher notes Great call at a great value Acrylic with a polished brass band.