In no case is it made of stainless steel. It is aluminum (at best) with all that this entails, such as corrosion due to sweat, so be careful if you have had issues with oxidation or allergies in the past. The positive thing is that it is lightweight.

The strap as a material is very good, it has no chances of breaking like the silicone strap I had. The problem is that due to the size it takes for my wrist, it tightens me quite a bit, resulting in leaving a permanent mark. If I enlarge it, it doesn't fit properly, so the only solution is to get the silicone strap again.