Attmu Acoustic Guitar Humidifier, Instrument Humidifier ,Best Guitar Moisturizer ,Automatic Guitar Humidity Control System, Black SMART DESIGN- Sponge design guarantees it doesn't leak in any way, never touches the guitar body and does not breaks the strings. The guitar humidifier safely releases moisture in sound hole in dry conditions. 100% SAFE FOR YOUR GUITAR- No clips or fasteners which can scratch the guitar finish. Exclusive non-drip design releases moisture evenly and slowly to eliminate warping, shrinking, and cracking. Super effective protection against low humidity damages. PORTABLE SIZE- smart size approx. 3.35 x 1.26 x 3.15 inch; Our guitar humidifier eliminates the guesswork and anxiety of maintaining your instrument's proper humidity level. It is a quick and easy solution to your humidity needs. EASY TO USE- Long-lasting, low-maintenance; Quick and easy to refill. Our guitar humidifier will help preserve your guitar and make it sound better. If you love to take care of your acoustic guitar, a humidifier is not optional, it's a must. MONEY BACK GUARANTEE- When you order our guitar humidifier today, you're protected by a 30 day, no-questions asked money back guarantee. HIGH-QUALITY AND TOTALLY RISK FREE, why not give it a try ?