Perfectly round, rimless Core 2 glasses are made with the famous Silhouette Minimal Art, titanium, hingeless eyeglass frames. The Core 2 is the lightest round spherical eyeglasses frame we have seen, and it is made with the highest quality materials. The frame is delivered in 46mm demo lenses, but you can make lenses in just about any size from 38mm to 55mm. For the chassis, it is available in three bridge sizes (17/19/21) and three temples sizes (140/150/160). We make these frames together with demo round lenses 46-19-140 which will work for most people.