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 1.2cm wide and 50m long. This is a set of white and black. Occasionally, the bulk may appear different due to the winding of the core or the adhesion of the glue. Please understand that this is a manufacturing error. It will be shipped in simple packaging.