Addi's circular knitting needles are made from a slow-growing, sustainably sourced bamboo, making them ultra-lightweight and perfect for people who suffer from a nickel allergy. They are also naturally warm to the touch, so they are also the ideal needles for arthritic hands. The extra smooth surface allows stitches to glide over the needles with ease. These circular knitting needles are available in lengths of 40cm (2.50-9.00mm), 50cm (2.50-9.00mm), 60cm (2.50-12.00mm), and 80cm (2.50-12.00mm).