BMW B6509 is a Rimless frame for Men, which is made of Metal.Most metal frames are made out of Monel. Monel has a copper and nickel base. This metal can be corrosion resistant, strong, and easily adjusted. It retains its stability and shape. This model features a Rounded Edges shape, with a Single Bridge.The BMW B6509 Sunglasses feature the following logo: BMW on top of left lensAlternate Fit. Alternate Fit frames have a specially designed bridge for those with higher cheekbones and wider nose bridges. Alternate fit ensures the frames rest on the nose and prevents sliding.These Sunglasses work well for people whose style is: Unique, Sporty.Ideal for usage with: Fashion.BMW B6509 Sunglasses come with a cleaning cloth and protective carrying case.