Boveda Directional Humidity Control Starter Kit Features: Kit includes 1 x 49% RH Size 70 packet and 1 x directional fabric holder Positions over your instruments sound hole, bridge, neck joint, or any other area you wish to humidify Directional fabric holder features a thick vegan leatherette construction that drives airflow towards your instrument’s body Ideal for musicians who prefer to keep their instrument out in the open Maintains your instruments humidity between 45–55% to prevent cracks, wood shrinkage, and other long-term damage