Kyser Lifeguard Humidifier - for classical guitars;

Your classical guitar deserves to be protected.It's an investment that requires steps to ensure its value grows over time. The Kyser Lifeguard Humidifier does just that. If you store your classical guitar in a dry area, simply immerse the Kyser Lifeguard Humidifier in water, shake off excess, and then position it in the sound hole. It will preserve the wood on your instrument by keeping conditions at the proper humidity. Fits sound holes 3 3/8” to 3 3/4”.