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I think they are the steel ones , slight bit of surface rust on the inside of the ring but will clean off ok

Have two biopace chainrings if anyone wants them 48t+ 38t

Thought these might be of some use to someone on this site . I have one 48t and one 38t shimano Biopace chainrings for sale , just make me a sensible offer if your interested. <http://static.flickr.com/110/315059829_38e05ce48e.jpg?v=0>