When you order 4' of track, for example, you get a total of 8' of track. 4' of shallow track for the bottom and 4' of deep track for the top. This is for both the basic plastic track and the more expensive roller/nylon guide track.



The track does need to be attached to something, although it does not necessarily even need to be a frame per se. I have seen frameless cabinets where the track is simply attached to the top and bottom of the cabinet.



But for a reptile cage you typically want some sort of litter dam and maybe even something to hide lights at the top so a frame is a good way to accomplish this.



How you attach the track really depends on what type of track you buy, with the two basic types being the plastic track and the roller track.



You can also get track for the sides and this is nice for a cage with a less than perfectly square opening as it hides the fact that the glass does not match perfectly with the side or the fact that the glass itself is not perfectly square (or both). Typically just the regular track is used and attached to the sides.



Or you can put a groove in the wood.



Speaking of which, there is also track made from solid wood.
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Currently keeping a small collection of various Gonyosoma. Both G. janseni and G. oxycephala.

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