Are these old R888s still usable?

Recently sold a set of wheels that had been in storage for a number of years which had R888s fitted to them. The buyer didn't want the tyres so they are still in my possession, but I've noticed that they have some cracks in the rubber. Below is a picture of the worst one, my question is, are they still usable?

 

Well off/hard, Scrap mate, not worth fitting

 

I make the most of my tyres and I wouldn`t dream of running those.

 

Thanks guys, thought that was the case.

 

Fit for burn outs lol