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Veddy interesting nylon mesh tubing. The diameter is about 9 mm when relaxed, but can squash down a huge amount. Springy - doesn't stay squashed.
Bulk Pack. 9mm By the pack of 30 meters.
Rather fascinating stuff. We've swiped this stuff from the hardware store - electrical department - where it was designed to contain electrical wires. (Which some folks do actually use it for. Especially airplane builders. ;-) )
It is very resilient, you can squash it down to get it through a bead, and then it will spring back.
To get it through a bead, squash down the end and wrap with tape, and thread through your beads, then cut the taped part off.