Sorry Keith, i didn't see your last post.
Yeah, now that i come to look at it, they are indeed from a mould.
It's a very tough plaster, it's like stone. When i scratch it with a pin it leaves a white powder, but if i run my finger over the powder it goes away and it turns back to the red colour again with no signs of the white scratch.
It's a shame they aren't antique ones.