I wouldn’t buy!
If I could 0 stars I would. First, I ordered by mistake and cancelled in ample time but it was denied. Second, I get the product and the rings on the tubes are broken. Lastly, I will never use these because I am not sure if there is adhesive holding the layers of paper together. This was not described in the description of the product. It only states there was a 40 lb weight placed on the tube  and it did not collapse. I don’t care about how much weight the tube can hold before crushing. My bird ( parrot) will never be a body builder so I suspect there will never be weights in his cage. I will throw this away and just eat the money I lost. I suggest being more careful than I was. This may not be safe for your winged buddy.
Rating: 1 stars