Oxidized Sterling Silver Racing F1 Adjustable Ring. .925 sterling silver. The Oxidized Sterling Silver Racing F1 Adjustable Ring is a striking piece of jewelry that blends elegance with a sporty edge. Crafted from high-quality sterling silver, the ring features an oxidized finish that gives it a vintage, worn-in look, enhancing its character and appeal. Steering wheel turns in place, making this ring useful as a fidget ring.