Sturdy yet unusual design. A set of 2 plastic nuts, bolts and anchors is used to attach the shell frame to the frame that secures the shell frame to the cage. You'll see what I mean when you order. One of my plastic frames also had blue marker writing on it, which didn't excite me. The shells sag a bit when placed in the plastic frames, about an inch forward, but not too bad. I'm very happy with them but they were a bit pricey.
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