These look pretty similar to what I got. I've used them for 3.5 years and they work great!

https://www.amazon.com/gp/product/B01DL2YVBM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I also have some OSO aluminum ones that I like a lot as well but they are a lot more expensive. For the price the Iron Lab ones above are darn good.

All I can say is anything is better than the damn springy ones that gyms have!