The Schmetz Costume Needle Set is designed for costume and cosplay projects. This ten and nine-pack includes universal, stretch, jeans, microtex, twin, and topstitch needles ranging in sizes from 70 10 to 100 16. Use stretch needles when sewing knits and stretch fabrics like spandex, lycra, elastic, and dance swimwear fabric. Add decorative stitches to your costumes by using the topstitch needle. If you are sewing dense materials such as vinyl, synthetic leather suede, or microfiber, then the microtex needle is your best option. The denim needle can be used on canvas, denim, and twill, while the universal needle is excellent for woven fabrics, cotton, poly cotton, linens, nylon, and polyester. These needles can be used in household sewing machine brands where needles with a flat shank are required.