Polished to a Brilliant Shine Arundel's Stainless bottle cage is 4.2mm stainless steel tubing bent in the same graceful curves as their original model. The mounting spine is a stamped piece of art. This is not a standard metal cage. The finished cage is polished to a brilliant shine and will add to the aesthetics of any machine. Stainless cages area popular choice for steel frames, randonneurs and gravel bikes. It is also well proven at the top levels of competitive cycling. It's adorned the winner's bike at Paris Roubaix and carried bottles securely in Flanders, the Tour de France, etc.