I read about the “rotating silicone bottle washing” in an article on my smartphone, and went to the store to buy it. I thought it was the one I was looking for from the shape, so I bought it. When I got home and looked at the product more closely... it didn't say it was a rotating bottle? I checked immediately on the app, and it seems to be a different product. I made a mistake in my purchase, but it's also a little heartbreaking that the shape is so similar. I was looking forward to it, so I was disappointed. The price is the same, too. There may not be many people who make the same mistake as me, but if you're in a hurry when you're shopping, be careful. As for how it feels to use, it's good because it can fit into small-mouthed bottles. However, the fact that it can be stretched is a disadvantage. If you don't stretch it out and use your wrist to turn it in its shortest state, the brush part, which is the most important part, moves around and you can't scrub it left and right. You have no choice but to move it up and down to wash it. Is there a difference between each product? Is there a knack to using it? I'm giving it 3 stars because it's my own fault for buying the wrong product.