This is for standard gauge & Passap knitting machines.No ribber is needed. Make a bikini in sizes 4-12 with shaped cups to suit the wearer. Cups and seat are short-rowed to perfect the shape and a complete article on short-rowing is included. Other yarns that are suitable for the use and match the gauge may be used. If you would never, never wear this, make one for a bridal lingerie shower. It never fails to bring down the house!