As we only deliver rimless glasses, we only use the best materials to secure that you get a safe and strong product. For the frame you can choose from acetate, steel or titanium materials. For the lenses we standard use a 1.61 material, which is strong, thin and very light. We only use Hoya lenses. Hoya is a world leading producer of prescription lenses. All the lenses we use have an anti-glare and scratch-resistant coating.