Remo Drum Heads 3700533 4 in. Dynamo Pack, Black - 10 Piece

The DynamO is a hole cutting template for resonant Bass drumheads that provides a vent hole for all drum mics. The DynamO is a laminated Mylar with a high strength adhesive backing providing added durability for the drumhead to prevent tearing when adding or removing microphones. Available in black and white sizes 5.5", 7", 9" and multi packs.