The cords are made of silicone and come in a set of three, packaged in a tin box [diameter 68 mm] with logos on top and colour sticker on bottom.
One set contains 1* ~150 cm (60 inch) & 2* ~75 cm (30 inch) cords.
How to use:
Firmly press the tip of the cord onto your needle (~1 cm) and start sliding your knitting on or off the cord and remember to check that your joint is secured all the time.
When your stitches are in place, then gently remove the cord from the needle by pushing it off with your fingertip or nail, do not pull the cord off.
Just pop it gently like an expensive champagne cork.