The Haydel's Game Calls Variable Tone Mallard is a premium double-reed call precision-machined from high-density black acrylic for maximum resonance. Designed with a unique variable tone system, it features a specialized hole in the exhaust barrel that allows hunters to sound like two different ducks. Keeping the hole closed produces the deep, raspy tones of an older hen, while leaving it open creates the higher pitch of a younger hen. This weather-resistant open call utilizes a double O-ring design for an airtight seal and consistent backpressure, making it easy to produce everything from loud hail calls to subtle low-end finishing notes. Safety Note Due to the high resonance of acrylic, avoid blowing the call at full strength in enclosed boat blinds or pits. Regularly rinse the unit with lukewarm water to ensure the variable adjustment mechanism and double reeds remain free of debris.