Shown below are some cracks on the underside of Chris' saddle. He has replaced it which is good for him.
Shells are, I would think, made of some kind of thermoplastic polymer. I'm also guessing crack propagation was from the sides towards the center, by looking at the picture For example, the first one on the left starts out from the groove just below the saddle covering. The second one seems to shoot out from the right pin all the way to the left. Also notice discoloration around attachment pins.
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