They are Velcro. They work. But they sent me white ones instead of gray ones as pictured.
These straps are way better than the ones that came with the machine.
The straps are perfect, I was able to secure the Donjoy iceman for more impact.
As of today, December 6, the order has not yet been delivered. I’ll wait another day or two before I will submit a review. Pretty slow service.
Straps were made of great quality