The E51 BRH is KUBORAUM's E-Mask in a butterfly-winged single-shield silhouette. Grey lens curves outward at each side, dipping at the centre into a low bridge, with minimal acetate framing visible only at the temple connectors. The frame is acetate and nylon construction, with Havana Red and Black Shine accents on the temple lengths (visible from the side profile rather than the front).
Lens width ninety-nine millimetres, bridge zero, temple length one hundred and twenty millimetres. The shorter temple holds the wide shield close to the temple bone - a longer arm would not hold this width seated. This is KUBORAUM's lightest-frame E-Mask: the lens itself is the silhouette.