Knit Pro says Cubics needles have a “unique ergonomic shape that provides comfort to the hand and yields uniform stitch formation.”
KnitPro Cubics interchangeable circular needles are different from most needles out there. Instead of being round, they’re square! This makes them very ergonomic and more comfortable to work with if you have joint problems like arthritis. They’re also great for beginners because of the grip and control they provide.
Interchangeable circular needles are ideal for knitting in the round projects like socks and hats. Cubics are especially suited to this kind of work because they hold the yarn so well. They’ll give you uniform stitches.
Cubics are made from laminated birchwood and warm up in your hands. The size is measured diagonally and you can fit them into any standard needle sizer just like a round needle.