#Click here for a list of sakara's stretch-stop tapes Black Half Bias Stretch-Stop Tape, Set of 2 Rolls, 10mm x 50m Black Unused Width: 10mm Length: 50m Color: Black Iron-on type with adhesive on one side. Used to prevent stretching, it has moderate elasticity compared to straight tape, so it is used for curved parts where you don't want stretching. Used for necklines and armholes. Also suitable for preventing overstretching when sewing thin fabrics or knits, which have moderate elasticity. Economical 50m roll. Also selling 1 roll, 3 rolls, 5 rolls, etc.