The Attack Drumheads Orbit Ported bass drum head provides the versatility and tone drummers crave. Its patented port design delivers deep, punchy lows and focused attack, allowing you to achieve a range of sounds suitable for any genre. The hybrid construction combines the warmth and resonance of a single-ply head with the rich sustain and projection of a double-ply. With the Orbit Ported, you get the best of both worlds in one innovative drumhead. The strategically placed vents around the outer edge open up the drum's tone, enhancing resonance and reducing muffling. You'll be amazed at the musicality one drumhead can provide. For drummers seeking a balance of power and nuance, the Attack Drumheads Orbit Ported is the only choice.