You can buy it from any JayCar , Dick Smith Electronic Stores ..etc
It is very small ' dia ' tubing used in Electronics for covering wiring ... such as ' two wires soldered together ' ....it is ' shrink wrapped ' around the exposed wire to insulate it from causing shorts......
I've used it in Electronics myself ......used a cigarette lighter to gently ' shrink ' the tubing....
It comes in different sizes and coloured coded.
Flash.......
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