The 22" Frost Drumhead have a 250 micron layer with anti-harmonic inner ring much attack and sustain duration easy to tune. Coated with a scrachada layer that provides a warm sound and attack ideal for Band and March drums and all kinds of popular acts. The design of the aluminum ring together with the 360º plastic drawing make them fit perfectly to any helmet recess and a quick coupling with the ring is achieved. All the best bands and marching bands with NPdrums® instruments use this patch for their percussion instruments. Manufactured with the guarantee and experience of the evans drumheads brand .