YT&H Knitting Cords to hold stitches while you work on something else. They are (2 mm) silicone tubes. The 4 cords come in a screw on top aluminum round tin. The tin is: wide (3 1/4) by deep (1 1/2) inches with plenty of room for more knitting notion. 

You can fit a (2 mm) DP needle snuggly in the tube to easily threading the tubing through the stitches. 

There are: 1 x (60 inch), 2 x (30 inch) & 1 x (20 inch).