addi SOS replacement cords come in 24", 32", and 40" lengths and can be used with addi Turbo Clicks, addi Bamboo Clicks, and the Long Tip Lace Clicks. Unraveling a knitted project is never an easy task, and it often leads to dropped stitches and wasted time. However, knitting with the patent-pending cord allows for the effortless insertion of a lifeline as you knit. To open the lifeline eyelet, simply grasp the cord on each side of the eyelet and press together. Thread your lifeline yarn through the eyelet, and continue working as normal. When not in use, the eyelet collapses on itself and disappears into the cord. 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.