Boveda packets utilize a specially prepared solution of pure water and natural salts, contained within a water-vapor permeable ''reverse osmosis'' membrane. Packets typically last between 2-5 months; longevity depends on time of year, case quality and ambient RH levels. Replace when packets become rigid.

• Replacement packets for Boveda kits, 4-Pack
• Works with both the Guitar and Wood Instruments Kits
• 70 gram, 49% RH packets maintain 45-55% relative humidity.