Ray-Ban O-4

Brand: Ray-Ban
Style: Eyeglasses (not sunglasses)
Frame Shape: Square/Rectangular, which is a classic, versatile shape.
Frame Type: The front of the frame appears to be a semi-rimless or drill mount style, where the lens is held by a thin wire or is mounted directly to the frame at the top. The image shows a full rim across the brow. The search results show the model code RX5419D 8269, which is a full-rim plastic/acetate frame. The frame in your photo is a metal alloy with a brow bar and semi-rimless look at the bottom, which suggests it is a different model, likely the Titanium RX 8269 model.
Frame Material: The frame is a metal alloy, likely a lightweight material such as titanium, given the appearance of the metal brow line and the temple design.
Temple Design: The arms (temples) have a distinctive carbon fiber or patterned inlay/design, giving them a modern, textured look.
Color: The main frame color is a dark metallic brown or gunmetal finish.