Humidity Control Sheet for Recorder - Moisregart Black Available for immediate purchase ⭕️ Brand new, unopened This sheet uses a high-performance water-absorbing polymer to absorb moisture when the inside of the instrument case is humid, and to humidify when it is dry, maintaining a constant humidity (40% - 60%) inside the instrument case. Simply placing it in your instrument case prevents cracks and warping caused by dryness, always creating the best environment. I will carefully package it and ship it slightly bent. It will be shipped in a Nekopos box. Thank you.