This is a review of the “Trixie Activity” feeder (which has a base and tunnels/tubes). FYI - when I bought it, the price was a great deal at $12.79. I notice as I write this review it’s currently priced at $16.26. Either way, I think both prices are a great price for this quality feeder. The most important thing about this feeder is to realize that you need to reach underneath and turn the handle of the piece that changes the size of the openings to match the size of your kibble so that your food will fall through into the feeding tubes. :) They say on the product description that this has an “adjustable level of output to vary how quickly treats are released - but, I don’t see how that would truly work. You must adjust it so that your kibble/treats can come out into the tube. Once that is adjusted to the correct sizing, the kibble simply fills the tubes/tunnels. There is no way the cat can reach up and “probe” to get more food or treats to come out - you size it to the kibble and it fills via gravity. So, it’s not “adjustable” in the way they describe with that sentence. This is not important to us, but if you wanted something that did let you vary the amount of kibble/treats, then this is not for you. The container on top that holds the food is 4” wide inside at the top, but it is cone shaped so it narrows down to about 2” wide where it inserts into the top of the food tunnels (and that container is 2.25” tall). How much food this feeder will hold will depend on the size of your kibble, of course. You fill the container on top with kibble, screw the piece from the bottom so that the food falls into the tunnels, then a lot of food will fill the tunnels and you can then top off the container with more kibble. In the end, it holds a surprising amount of kibble! Overall, the feeder base is 11” in diameter and about 5.5” tall. The plastic is very sturdy and this seems to be a high quality feeder. There is a rubbery ring built into the base to keep it from sliding around, but it does move around from our cats using it. I think fur builds up under the ring so the rubber isn’t as effective as you’d think it would be. The feeder tubes are 2” wide. As you see in the pictures of the product, three are tunnels that are flat on the bottom of the feeder and the other three are tubes that stick up in the air. Any cat should easily be able to get food from the three flat tunnels. If they just like playing around while feeding, perhaps they would try getting food from the tubes - but I’ve only seen our two cats use the tunnels so far. Doesn’t really matter, as the kibble refills whichever of the tunnels/tubes the cats eat from. The lid on the top screws on - which is good if you have a cat that knows how to lift lids! The base has a ridge around the edge, so the kibble all stays on the feeder, which we really like. Our normal gravity feeders had kibble scattered all around nearby, this feeder keeps it all on the feeder base. Of course, if your cat pulls out a kibble with her paw and then does not eat it, the kibble will end up not on the base - so you can collect kibble around this feeder, depending on how your cats eat. It says you can clean this in the dishwasher, but we haven’t tried that. I don’t know how you would stop a ton of water from collecting in it if you used a dishwasher? Anyway, our cats - a 12 year old girl and a boy just turning 1 year old - easily figured this out and started eating from it right away. No problems or delays whatsoever. The reason I got this type of feeder was to slow down the gobbling eating habit of our older cat, who overeats and gets overweight. We feed our cats mainly wet food, but we have dry kibble out to free feed since we have a younger kitten that is still growing - so I thought this was a good option to slow down her eating. He doesn’t seem to overeat. Actually, she is the first cat we’ve ever had that overeats! :o The feeder seems to be having the desired impact. She definitely eats less quantity of kibble when eating it one piece at a time from this feeder. :) Hope this info helps someone. c~