These Unger DS50Y replacement sleeves work in conjunction with the Unger ProDuster to provide a convenient, sanitary dusting experience. The disposable microfiber material sleeve slides over the ProDuster's bendable head to attract and hold dust, keeping stray dust particles off of floors, fixtures, and your workers. Once the job is done, just remove the sleeve and replace it with a fresh one to begin your next dusting task. 50 sleeves per pack