Diaper Service Quality, 100% cotton gauze that are soft, durable and highly absorbent. These diapers are also packaged within the case in 1 dozen bags. We especially recommend these diapers for embroidery and embellishment. All four sizes of Chinese prefolds have white surging stitching making them excellent blanks for burp cloths. 2x5x2 and 4x6x4 refer to the layering. For example, 4x6x4 is 4 layers on the sides and six layers in the middle. The Infant sizes are 12x16 inches and fit babies from 7-15 lbs. The Regular sizes are 14x21 inches and fit babies from 15-30 lbs. 20 dozen per case, 1/2 case minimum per size.