This one is more tricky than it looks! It is 18cm long at full extension and 14cm wide. It is cage mounted and rotates a full 360 degrees on its axis. Place treats in the Tumbler and watch your pet work out how he must spin the Tumbler to work the treats over the lip of the food funnel and into the retrieval slot at the bottom. The food funnel can be moved up to increase the level of difficulty. Small primates, Rats and Sugar Gliders might like this toy too.