They have zigzag scrubbing strips and high quality knitting for better absorption and debris pickup. Double finished edges provide durability and shape retention. Durable up to 500 laundering. Withstands up to 200° F hot water for bleached free sanitation. Color-coded for glass/mirror and special applications to help reduce cross transmission. Sold in case packs of 6. Price shown is for each. See page 700 of our 2011 Catalog.