CPC G10D 13/02 (2013.01) [G10D 13/16 (2020.02); G10D 13/20 (2020.02); G10D 13/24 (2020.02)] | 21 Claims |
1. A drumhead with reduced volume, comprising:
a layer of a porous material; and
a ring of a compressible material adhered to the porous material, the ring defining an open inner central area.
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