My dog was immediately excited about these the MOMENT they came out of the package. I gave him the solid one right away and he was occupied with it for about 5 straight hours. It's the perfect shape for him to hold onto, and it has a good weight to it. I popped the hollow one in the freezer with some kibble and water and he loved the challenge of getting it all out. Really fantastic toy set, I cannot recommend enough!

For reference, my dog is an 11-mo-old mini bernedoodle, about 37 pounds

So this set, one is hollow & 1 is solid. The hollow one is great for freezing a snack inside. As long as it has a filling of some sort, my dog loves it. If he empties it, I have to get it away from him fast. He then bites chunks of rubber off the sides. The solid rubber one has held up much better. I think the set is great. It offers 2 different entertainment options. I just try to swap the flutes quickly when the hollow one is empty. It washes up great in the dishwasher too.

These are a huge hit. Paired best with peanut butter

Well you get one that you can freeze with treats that works just perfect wow! Then the other solid one we will hold it in his mouth when are pup is feeling in a biting mood.

One of the flutes is hollowed out to dispense treats. I filled it with a yogurt smoothie with berries in frozen water and served it for NYE. So cute how my dog holds onto the flute stem as he licks out the treats. Made out of very sturdy rubber, the other flute is solid rubber with a nylon core. I expect that both will last a good long while. I’m very pleased!