You can get it at eny electronic store like Radio shack, Fry's, Best Buy, Circuit city, etc. It's the stuff they use to help organize wires. Honda usually uses the coiled looking black ones, then wrap parts of it with electrical tape. You can use hi-grade wire that specifies resistant to "some" heat if you like as well. When I got my DC header, it came with the perfect length of O2 extension, so I didn't have to worry about it hitting anything hot and melting.