The Bottle Caps are Blue's innovative system of nine interchangeable capsules, each one offering the recordist a different tonal characteristic and pickup pattern. From airy highs to larger than life lows, these Bottle Caps capture anything from vocals to bass, wind instruments to horns - and everything in between with a level of detail and clarity found in only the most expensive and rare vintage classics. These capsules work with Blue's Bottle, Bottle Rocket Stage One mics, and Bottle Rocket Stage Two, or any microphone with a foundation for interchangeable capsules. Each capsule in this series are numbered from B0 to B8, each accompanied by their unique sound.

-Very unique compressed quality, extremely accentuated low and high frequency response
-Suggested Applications: Acoustic guitar, percussion, any highly transient sources, any acoustic sources that need very close miking or extra presence boosting to cut through a dense mix.

Further details can be found on the Blue Mic website.