The Boveda 72% Two-Way Humidity Control Packs for Wood Humidifier Boxes in Size 60 are rectangular prism-shaped packets designed to control humidity in various airtight containers. Made of wood and featuring a touch control method, these packets are safe to touch and can add or remove moisture as needed. With a 4-pack included and a special two-way humidity control feature, these packs are ideal for maintaining indoor air quality in your home. Made by Boveda, a trusted brand in indoor air quality products, these humidity control packets are a convenient and effective solution for ensuring a comfortable living environment.