Boveda is the world's most recognized two-way humidity control agent. Saturation agents, consisting of pure water and natural salt, are sold with the optimal humidity setting for each target product. As drying progresses, it releases only pure moisture through the reverse osmosis membrane inside the bag, and if the humidity exceeds the level indicated on the bag, it absorbs moisture from the air, thus repeatedly absorbing and releasing moisture, making it a humidity control agent with excellent humidity regulation capabilities. This Boveda starter kit includes everything you need for humidity control of wooden instruments, including guitars. This large set, made with highly absorbent Boveda 49% HA, is ideal for the high-humidity environment of Japan from the rainy season through autumn. Boveda 49% HA RH Pack x 3 This is a humidity control agent for musical instruments based on Boveda 49% (B49), with enhanced water absorption capabilities. It is suitable for use in the high-humidity environment of Japan from the rainy season through autumn. The humidity is set to 49%, which is ideal for wooden instruments such as guitars. Size: 135mm x 90mm Usage period: 2-3 months (Unopened: 2 years) Boveda Pouch Holder (Double Holder) x1 Boveda Single Holder ×1 ◆ How to use the holder Ensure that the Boveda humidity control agent has sufficient surface area to come into contact with air and place it in a location where it will not be crushed. Place one Boveda in a single holder behind the headstock or neck. Place the two Boveda pedals in the double holder so that they are inside or above the soundhole, or above the strings.・When closing the case lid, be careful not to crush the Boveda. *To prevent damage to your guitar and to protect it from leakage in the event of a strong impact to the Boveda, we recommend using the dedicated holder. *Boveda recommends replacing the product every three months. ◆Important Notes: In low-temperature environments, the moisture in BOVEDA may freeze or harden. In this case, warming it with your palm will return it to a normal gel state. Even if the state changes, the product's original effectiveness will not be lost once it returns to a gel state. • When using this product, do not use it together with other humidity control agents. Interference between humidity control agents may prevent you from achieving the desired effect. • The liquid inside contains salt. If the pack is damaged and comes into contact with skin, etc., rinse thoroughly with plenty of water.