The Hydraulic line 18" patch that NPdrums manufactures® features mid-range tones with low durability and greater durability. Built with two folds of transparent film of 177 microns. The Hydraulic line has a liquid substance that reduces the harmonics by applying between the two sheets that provide control with greater attack. The Hydraulic line series is one of the most popular Drumhead in the world for its characteristic black circle line. Available in sizes from 10" to 26".
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