Identify Roller Material

Hello, attaching photos of the rollers that came with our C&P Craftsman 10x15. If someone could help me identify the material (rubber? composition?) so I can know how to clean them, that would be appreciated.

image: IMG_5128.JPG

IMG_5128.JPG

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They look like dusty rubber rollers to me.

Blue Rubber, Oh..yeah…
It’s way mo better than the brimstone and treacle stuff.
Oder-less mineral spirits 4 cleaning.
best james

Blue rubber, use water miscible roller wash

Thanks for all the replies!
Is California Wash ok for wash?
This is what I though to use for press and rollers.

Ok. Did some reading and know California Wash will do the job.

Thanks again for your replies.