The Pro Tac SC Gold muff is the premium chop cut cup model of Pro Ears. Designed with a Noise Reduction Rating (NRR) of 25, the Pro Tac SC provide exceptional protection for the loudest environments while still amplifying quieter sounds for improved situational awareness. Constructed using dual circuit board technology, adjust your hearing and amplification levels separately for each ear to compensate for uneven hearing loss using the dual knob system. Additional adjustment for high and low gain using internal pin settings. The chop cut allows for easy shouldering of long guns as well as lighter weight. Pro Ears: For the ultimate in Performance, Comfort and Reliability.