SimpliDieux Bobbin Set of 6 | Multi-Color Nylon Cords | Lifeline Cord | 0.5 mm diameter | 20 yds Each Color

What is the right lifeline?  It’s one that is small enough to not stretch your stitches.  It’s easy to take in and take out.  It’s easy to find in your project.  And, it’s reusable.  What more could a knitter want?  How about a set cord in 6 colors!