From the Manufacturer:
Knit perfect circles in your sewing projects with the Boye Plastic Circular Knitting Needles. These knitting needles are made from lightweight plastic that falls easy on the hands. Use these needles for your DIY projects that involve bulky, super bulky or jumbo weight yarns. Ideal for creating circular patterns in your knitting projects, these size 50 needles have a flexible cable hold that stitches and releases the heft of the project from the knitter.