I am using direct burial. It is black. The speakers are 10 feet off the ground facing down (or will be). The wire is an odd size. I will be attaching it to wood, but there is only about 3/4 of an inch, so whatever I use, it will have to fit in that area. I would like to use something black, but I cannot find anything. Someone suggested outdoor staples painted black, but I don't really want to do that. Conduit is not really an option as it will stand out too much. Media1, I might give your suggestion a try. I often do that when I have many wires together on long runs in the basement, and just zip tie then to electrical staples. It works pretty well. Well, if anyone has any more ideas, let me know. Thanks.