I bought it for trigger therapy. For the same assortment as the other reviewer: 4 rainbow balloons, 2 pink balloons, 2 green balloons, 1 solid orange, 1 solid purple, 1 teal two-tone, 1 yellow-pink two-tone. Two-tone balls are made of a different material, much softer, lighter and more buoyant. Hard and marble balls are made of heavy hard rubber. The size is exactly what I was looking for, unfortunately when opening the bag all the balls were slippery like they had been splattered with oil. They leave a film on your hands, on the floor, and I assume the same will remain on your clothes or anything else you touch. I took two balls (an iridescent marble and a two-tone pink-yellow one) and tried washing them several times with soap and dipping them in a hot pool of water several times (that's how I found the two-tone ones float! The marbles don't) and after all the marble looks much better on him. Now it looks like sticky rubber like a beach ball should be. The two-tone ball seemed to get better, but when I step on it barefoot (like trigger point therapy) it slips out from under my foot, leaving a large amount of the substance on it apparently still there. I definitely don't want to rub that on my bare skin, they're probably from China and I don't trust that stuff. Still not sure if I'll be returning them or keeping them to avoid the hassle of just not using two toned balls.
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