These are machine wefts of hair for weaving/sewing/bonding. These techniques use wefts of hair designed to be affixed using a braiding and weaving technique or extension glue. Weaving involves first creating a series of braids or "corn rows" in the hair, then use of a needle and thread to secure the individual wefts to the braids. Bonding involves creating a clean section in the hair, sizing the weft to fit the section, then attaching the weft using special hair extension glue. Both techniques require careful removal. Weaving and bonding are advanced techniques and require skill and training.