Natural Sissal Ball

Hi, bought a Natural Sissal Ball for my young rabbits yesterday, when i gave it to them they just started tucking in! no playing just EATING - I took it away just in case. The label says "completely safe" but doesn't actually mention it is for eating. Is this the norm and is it safe for them to eat?

It should be OK for them to eat if it says so on the label. My two like to eat them to.

O.K. thanks. Never used them before so just wanted to check. They seemed so keen to devour it! I had expected the odd nibble and taste but they moved right in for a meal!!