The Ultra-Pure microfibre pad dryer is for drying the pads of oboe, flute, clarinet, sax, bassoon, and other woodwind instruments. To use, just place the microfibre pad dryer under the wet pad, press the key closed for a moment, and release the key. Then remove the pad dryer.Replaces the traditional pad drying papers. 80% Polyester / 20% Polyamide. No chemicals. Washable. Will last for years!