Hi everyone, this is my first post, previously i only lurked. But to the point. I was browsing dhgate in search of new designs and founded something interesting: a new design of A-ring. It's a snapping anatomic type. What's interesting is the lock. It is hidden inside the ring. It makes all design more stealthy. Chineese calls them "open mouth". My question is it's this design used by any of renovned manufactures, or chineese invented it? Also have anyone have any experience with it? Here's another photo of cage with this ring: Sorry for my awful english.