The wig cap of a 13x4 Lace Wig is made up of a lace wig cap and a mechanical wig cap. The hair of the lace part is artificially knotted the human hair in the holes of the lace part and sewn on the mechanism wig cap.The lace part covers the front half of the top of the head, 13 refers to the distance between the two ears, and 4 refers to the distance from the hairline to the top of the...