Well of course you will need to buy more than just a support rod (lol) but I mean, even if you are building your own cage from scratch (etc.)... The support is unbelievable! I connected multiple XL cages together so of course needed A LOT of support in order to hold up all the roofing (these were also covered cages!). I was able to fit in these support bars no problem and it held up 3 XLs together! And like the writer below said, they arent even noticeable when you match to your grid colour! ;) I dont even know of any other piggy cage place/store that offers these type of amazingly strong support bars with such a clean look to boot! ;)