It is a simple rubber band that does its job just fine.

Pay attention to the length, there is 1.20 and 2.50, so think about your exercises, evaluate your needs, and check the corresponding price.

Also, pay attention to the thickness. There are 6 colors, each with a different thickness and therefore a different resistance. The difference between two colors is quite noticeable. This is the 3rd level of difficulty. The previous one is green, and yellow is for beginners.

As a product, I find it quite expensive (I'm speaking generally about resistance bands, not specifically about this one), so it's worth looking for deals.

After use, you can apply talcum powder, especially in the summer, to prevent it from wearing out.