Although it is hard to see, that is the shell of the roller bearing in the pedal. The rollers had fallen out and the shell could not be removed, and even if it could have been then the shaft on 3 of the 4 pedals was so badly damaged it was a waste. Note to self, change the bearings or at least grease and check them each time I change the chain.

I ordered 2 new sets of pedals from Torpedo 7.