Ideal for shoes as well as electronics, instrument, or sports bags. Protects against moisture-related mold, mildew stains, rust, and unpleasant odors. The indicator changes from blue to pink as soon as saturation occurs. Reusable after drying on a radiator or in the microwave. Absorbs up to 30% of its own weight in water. Material: Silica gel/plastic polyester. 9x12.5x2 cm