What are the deninsions accoss the widest part (top) mine is 9 mm's? I am trying to figure out the size I need (small, medium or large)?

small open approximately 5 mm medium open approx 7 mm large open appox 10 mm

Contact the Costco Hearing Center for the recommended dome for the 10.0

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🔊 Hear the future, wear the difference.

DISCREET COMFORT FIT - Small, open design offers breathable comfort for all-day wear without sacrificing sound quality.
PERFECT MARVEL MATCH - Optimized for Marvel hearing aids, ensuring flawless integration and performance.
BULK PACK CONVENIENCE - Get a pack of 10 domes, so you’re always ready with replacements—never miss a moment.
EFFORTLESS SOUND CLARITY - Experience unmatched audio precision with the Small Open Dome 4.0, designed for crystal-clear hearing.
UPGRADE YOUR HEARING GAME - Join the community of savvy professionals who trust Phonak for cutting-edge hearing solutions.

Phonak Small Open Dome 4.0 is a pack of 10 premium hearing aid domes designed specifically for Marvel hearing aids, delivering clear sound, comfortable fit, and seamless device compatibility for enhanced hearing experiences.

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