It's got a plastic screw through the inside and a hole at the top, so you drop treats in it and rotate the lid so there's a much smaller hole in play. The treats disappear down the screw to the bottom so the cat has to roll it about to extract them. He -loves- nosing it about the floor and patting it with a paw and occasionally rolling around on his back, wrestling with it.
:-) they are great. I got the dog's KONG version for my poochies. Sadly as they have grown they have actually managed to chew the top right off one - I jest not!
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