I know that some do use the document cover spines for this. You can get a box of 100 for ~$20... you choose sheet capacity (width of opening) and color - white or black. http://www.amazon.com/C-Line-Binding-40 ... B0006HWA4QSTRrabbits":2s1cu0hr said:I believe those are plastic spine bars made to use for documents, any office supply store will have them.
Personally I just installed metal corner bead on my homemade cages, I bought 8 feet of it at Home Depot in the drywall section for $1.98 and they cut it into 2' strips for me in the tool rental area. I was able to cut it with good scissors and I used my c-ring pliers (regular pliers would work too) to crimp it around the edges. I like that they can't be nibbled on and they seem more secure.
Edited to add the photo of where I got the idea from, not my cage.
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