Check the listing for details. Evans HD Dry Coated Drumhead - 18 inches. Condition: New. Listed at 30.99 USD. Dry Vented for Total Overtone Control Equip your kit with Genera HD Dry coated heads from Evans, and you’ll immediately see why they’ve become such a secret weapon in the studio for many drummers here at Sweetwater. These intricately formulated heads come double-plied with a 7.5-mil inner layer and a 5-mil coated outer layer before being further treated to a 2-mil underside control ring and Evans’s proprietary dry vent drilling around the outer edge. As a result, drummers will revel in a batter design that offers both remarkable durability and impressive response control. Tonally speaking, Genera HD Dry heads still provide that punchy impact but with significantly less sustain and harsh brilliance, resulting in a drier, mellower sound that effortlessly grooves in the pocket.