If a complex pattern is knitted and a mistake is made, it is difficult to unravel the knitted part again, as the stitches are hard to check. It is simple though with the addi SOS - the lifeline thread can be simply fed directly into a row of stitches, using a slitted thread, which limits the extent to which unravelling takes place. Pack contains 3 cords - 60cm, 80cm and 100cm Please note: the length quoted is achieved when the appropriate tips (sold separately) are attached. .