Unger Professional Combi Refill Sleeve, 18" 18-inch Combi Refill Sleeve is a replacement refill sleeve for Unger's 18-inch Combi, extending the life of your window cleaning tool Microfiber sleeve holds more water than conventional materials Simple design with self-adhesive strap closure ensures the sleeve stays in place Durable, reinforced seams make it washable up to 500 times