Looks like two pieces of waterjet cut plastic that have been molded and glued together. The only downside to this approach is that the flexing will deform the discs slightly, but it works well. Also, waterjet cutting leaves a rougher cut, which I think could be mitigated with a slower travel speed or a new waterjet tip. Either way, this is a decent product that drains better than an oral feeder. Never leave a brush hanging from a stick as it will hold water in the cracks.
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