material the column is made of to make a cat condo?

Trying to make a cat condo. what is the round column that the rope is on made of?
Answers:
Usually some kind of wood. A tree limb or small trunk, perhaps.

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you can get the tubes at a lumber yard - they are heavy duty cardboard

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THere's several options you can use.
The first one is wood, and that can be pricey.
The second is pvc pipes, those run cheaper and are easier to glue the rope to.

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heavy duty cardboard and carpet, sometimes you can find different size heavy tubes to make them with you can usually find them at craft stores and most carpet places will sell remnants

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I have made a couple of these we used several different things. On one we used mostly PVC and carpet. We put in a couple of tunnels in and the cat had some problems with the vertical tunnels. We have used 5 gallon buckets cut to size wit a piece of wood to make a lid. You can get scraps of carpet from the local carpet dealer. For the rope we used three strand Manilla/Hemp line, you just have to decide how much bulk you are willing to add to the outside and still have it look as if it fits in the room. We used something like a microphone stand for form the back bone of the tower. good luck.