I originally picked mine up at a Radio Shack type store years ago that was across from PM Hobby next door to Redhart Shoes. Don't think its there any more. Seems to me I looked for it when I was driving by and didn't see it. But you need to look for thin wall transparent Electronic tubing. Transparent so you can see it happen and not burn it, thin walled so you can easily cut it. . It came in 4 ft lengths and I believe it is by 3M.