Boveda 49% Two-Way Humidity Control Packs for Music Bows & Small Woodwinds – Size 8 – 10 Pack – Moisture Absorbers for Small Instrument Cases – Humidifier Packs – Hydration Packets in Resealable Bag;

The Medium (8 gram) Boveda pack measures 2.5" tall x 2.75" wide. Put a Boveda Humidipak in your air tight container and relative humidity will be controlled at the RH level printed on the pack. Boveda's 2-way humidity control is the only technology that can be pre-formulated to a specific humidity level with an accuracy of +/-2%. Boveda guarantees a constant level of humidity that never fluctuates or cycles.