Review on 🚲 Srami 2 Pack Bike Water Bottle Holder with Repair Tool Kit - Strong & Lightweight Bicycle Bottle Cages for MTB & Road Bikes: Includes Multi-functional Tool & 4 Stainless Steel Screws by Nick Atkinson

I believe the cages are thin aluminum. They came with mounting hardware and I had no problem installing them on two bikes. I bought two sets right away. These are cheap and poorly made bottle cages. Don't hold on to my polar ice cream or camel back or other brand bottles. You can bend them to make them tighter but honestly I think it was a waste of money. I'm just waiting for the day when I look down and find my bottle is gone.