These are the ball pit balls we decided to get to go with our Intex Swim Center Family Lounge Pool. We had to get 2 cases of the balls because of the size of the pool, and it still wasn’t full but good enough. These are awesome ball pit balls, they did not have a plastic odor to them and were bright vibrant colors. I wouldn’t say crush-proof because if you really squeezed one you could crush it. But for jumping into or on, they did not get smashed. If you do choose to get them plan on keeping them for a while and to keep them where you install your ball pit. We had to move and it was a nightmare pack-up and move. The 2.5” size is perfect for little kids hands. I would give these a 10/10.