Designed to work with Planet Waves Guitar Humidifiers.
The Planet Waves GH-RS Guitar Humidifier Replacement Sponge 3Pk is designed to work with Planet Waves Acoustic Guitar Humidifiers (see our SKU# 420552). Together, the system protects your guitars from damage even in the driest conditions.
The moisture reservoir is suspended inside the body; the system releases moisture evenly and slowly inside your guitar without actually touching the instrument. These high-absorption sponges maintain proper humidity levels and are quick and easy to refill.