So many things wrong with this item:

1. The pink color is a tacky pepto bismol color.
2. Even after fully inflating, the ball still has wrinkled creases that won't fill in.
3. There are unnatural black-ish marks on the inside that you can see-through.
4. Ordered 65 cm ball but it will only inflate to 55 cm ball. I think I was sent the wrong ball.
5. No way to know if I was sent the wrong ball because it doesn't come in a box but comes in a bag instead.
6. Smell of plastic will not go away and now my clothes smell like it.
7. Pump doesn't work well. After 10 minutes of pumping, it broke.
8. Not worth the time and strength I wasted on this item.

Really unhappy with this purchase. I ordered two balls and got prime shipping. Based on my height and the suggested size, I ordered a 65cm ball. It's way too small. I ordered the correct size based on manufacturer suggestions and now that I want to return it for a larger size, I will lose $8 off my purchase per ball to return, despite the free prime shipping. Dissatisfied and wouldn't recommend anyone buy this.

My previous balance ball developed a leak, and this was its replacement. I chose this one partly because it came with a pump - I didn't have the type needed to inflate a balance ball. The instructions that came with this ball were excellent, especially in terms of helping you understand how to determine if your ball is inflated appropriately. I'm sure it's a common mistake to pump up a balance ball to the point that it *looks* full but really isn't. This pump is very basic and requires your muscles to get the job done. I followed the instructions to inflate the ball most of the way and then let it sit for a day before inflating it the rest of the way. That last bit of inflation takes some work.

Once fully inflated, this is a very sturdy ball. I do some exercises while sitting on it, and it is perfectly stable (as a stability ball should be). I do some squats with the ball behind my back (between me and the wall), and it holds its shape perfectly. The price is right, too. Recommended!

This ball was a much higher quality than I expected and the instructions and packaging was more than I had hoped for. However, the size is nothing like I wanted. I ordered the 65 cm since my coworker has a 65 cm fit ball that fits perfect. But this ball is HUGE if I fill it completely. I have to leave it about 80% full in order to be able to sit on it under my desk, and even then it still is huge. It's got all my coworkers giggling as they sink into my squishy pink ball. It's not helping me with balance or core at all, it's more of a bean bag chair and my back is starting to hurt from using it. Maybe the material is more stretchy than indicated, but I would suggest buying small. I'm pretty bummed about it.

This ball is exactly what I wanted.

I have been wanting a stability ball to sit on at work. I have never used and exercise/stability ball before and was unsure of the features that I wanted or needed. I hate to admit it but purple was a key requirement. It is a beautiful shade of purple so that requirement was met. Beyond that the texture of the ball is wonderful. It has the ... bands around it that give allow for a nice texture to grip onto. It also as a more minute texture that clings to you. Not to much but enough that when I am sitting down I know that it is going to stay put because it catches on my pants and stays in place. It inflated well. I followed the instructions it came with and filled it part way up waited several hours and then filled it the rest of the way. Do NOT put the stopper all the way in until you are sure you are finished filling it. It is hard to get out even part way in, I can't imagine trying to get it out when it is all the way in. It feels nice and strong, which is nice because it is suppose to be burst resistant. I am a wiggler by nature and I find myself slightly bouncing when sitting on it. It is supper comfortable and exactly what I was hoping for. I have taken the advice of a friend and am only sitting on it for an hour in the morning and an hour in the afternoon until my core muscles strengthen up a little. I can feel the evidence of my efforts now, I can't imagine how I would feel if I tried to start sitting on it all day. This ball is exactly what it advertised and is exactly what I wanted (and in purple.)