The 4" long flexible fingers on this microfiber window blind cleaning brush are designed to help you quickly clean both sides of almost any size of window blinds. The 3 finger design enables you to clean both sides of 2 blinds at the same time. When done with cleaning simpy remove the microfiber sleeve and wash with your laundry to be reused again next time. Measure approximately 8.5" long overall, sleeve 4" long each. The sleeve is machine washable.