Is it like the Zoo Med brand? The picture shows a red one but mine are light brown. They are also made of a soft flexible material. You can hold them and they are not so hot you have to let go. I have hear some brands of heat cables are not like this and they get smoking hot. I sound like I work for Zoo Med...I do not.
I just would not want you to use a different cable and have an enclosure melting/fire issue.
This is the exact one I have at 23 feet. The first 5 or 6 feet are not hot. There is a blue mark that shows you where the heated part starts.
http://www.petco.com...Heat-Cable.aspx