I ordered the role, as it is significantly cheaper than the Blackroll. It also consists of a different plastic, similar to that which is used for flip-flops as a sole. Outside it is softer than Blackroll, but has a hard core. Whether one is the, is a matter of taste.
But I have the role of exchangeable because it smells very unpleasant. I would not have expected from a product "Made in Germany" "!! Will therefore use the Blackroll that does not have this problem.
