This is iron-on stretch-stop tape. This is the straight type. The straight type is for shoulders, pocket openings, armholes, zipper areas, etc. The half type is for necklines, armholes, etc., and other small items, please use according to the material. White is 1.5cm wide and 50m long, Black is 1.0cm wide and 50m long. This is a set of white and black. Occasionally, due to the winding of the core or the adhesion of the glue, the bulk may appear different. This is a manufacturing error, so please be understanding.