There was a free sample pack of these on the front of Your Cat (September) - well, wouldnt normally feed Royal Canin and the ingredients arent all that, BUT, as naughty meowy had run out of their normal bedtime biscuits, these came in very handy. I have to say they absolutely loved them! - they are enormous, it says on the front 'special large jaw' - I guess that means mine have big mouths LOL!
Anyway, they are similar size to the dental biscuits, bit like gobstoppers!
I'd get these again for the novelty value, I was pinging them around the floor and they had great fun retrieving them and there was a lot of serious crunching going on