Hemline Stretch machine needles are specially designed for two-way stretch knits, lycra, power net, silk jersey and other highly elasticated synthetic fabrics. 

This pack contains 6 needles in Size 75 (Medium).

These are designed to fit conventional household sewing machines.

What the manufacturer says
For knits with two-way stretch particularly those containing Lycra (TM), rubber in swim wear and lingerie and for sewing elastic. Specially designed scarf prevents skipped stitches. Use with texturised nylon, or polyester thread.

Best for; two-way stretch knits, lycra, power net, silk jersey, spandex and highly elasticated synthetic fabrics. Also ideal for elastic. 

Please be aware, needles are sharp and can also present a choking risk. Do not leave within reach of children and always supervise any minor using a sewing machine. Handle this item with care.