Silhouette 7799-7613 prescription eyeglasses are unique because they are unisex and are not gender specific. These are 3 piece rimless eyeglasses. These rectangular shape frames are made of titanium. Titanium is very light, flexible, durable and hypoallergenic. Although it costs more than other materials, but its advantages outweigh the cost of drawbacks encountered with other materials. This particular color is pinecone brown. Apart from this there is a wide variety of colors available to choose from which will compliment your unique style. The colors available are cocoa brown, copper, fossil grey, indigo blue, jet black, matte gold, mauve shadow, silver grey, sterling silver, true gold and wine. The size available is 48-19-150 B27 (eye size-bridge width-temple length-lens height in millimeters). These frames are not recommended for progressive lens but they are available with 2- year manufacturer's warranty. The 7799 model is from the Titan Minimal Art, The MUST Collection, and features an all titanium temple without hinges. The 7613 shaped pattern is a modified oval, which is good for progressive lenses.