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The SB-720-B is the matte-finish counterpart to the SB-720-A. Same seven-metal alloy, same 18 cm diameter and F4 tuning — but with a tumble-burnished surface that produces a uniform, low-sheen finish rather than the raw hammer texture of the A variant.
The matte surface photographs cleanly under studio lighting and reads as more refined in premium wellness retail environments. It is the preferred finish for buyers targeting the luxury gift and spa-amenities segment. Acoustic performance is equivalent to the SB-720-A; the matte process adds approximately 5 days to the production cycle.