Stretto Violin/Viola Humidifier, Extended Performance, Clear Red

Stretto is a super-absorbent polymer based humidifier that's very compact and very effective. The polymer absorbs much more water than traditional sponge-like humidifier without a risk of water leakage. Stretto releases moisture at an ideal rate for musical instruments and maintains RH% at around 50-60% for as long as 3 weeks. Attached to the case interior with Velcro (included).