Knitter's Pride-Basix Fixed Circular Needles. Basix birch needles have the lightness of birch and the strength of natural wood. They are ideal for today's chunky yarns-easy stitch glide and no snagging. They are gentle in the hand and provide hours of comfortable knitting with no hand fatigue. The polished wood surface works effortlessly with every type of yarn without slowing down the rhythm of knitting. Cords are flexible and easy to store. They lay flat with no kink or twist.