Hello, I'm a yoga teacher, and I'm also teaching yoga wheels now. In fact, it seems simple, but the requirements for practice are actually very high. The first is stability, that is, the weight of the yoga wheel must have weight. When practicing, the wheels will be stable and will not shake. The second is hardness, that is, it cannot be deformed a little. If you lie down or exercise, if you are crushed once, the transmission of strength will be greatly reduced. If you can't achieve the effect, you will practice in vain. The third is that the material of the outer ring is mostly a yoga mat bonded with glue, which is actually very good. There are many problems, such as easy degumming or strong glue smell. Some cheap yoga wheels are made of poor material and may be poisonous. Based on the above requirements, I recommend JJYOGA because their upgraded silicone yoga wheel is actually better in hardness and stability, and then it is a big brand. I use this for myself and my students. Although the price is a little expensive, safety and effect are the first.