addi Natura Bamboo circulars combine the flexibility of the addi cable and join with the beauty of smooth bamboo tips. They are the perfect choice for those looking for superior craftsmanship in a bamboo circular. Sizes are listed in approximate US sizes -AND- exact metric sizes for your convenience. All addi knitting needles are manufactured to exact metric sizes. Please Note: Every addi product purchased from an Authorized addi Dealer comes with a Lifetime Warranty from any manufacturer's defect.