The U8 BS is KUBORAUM's U-Series in Black Shine acetate. The silhouette is rectangular but with the lower corners cut at an angle, creating a chamfered geometric profile rather than a pure rectangle. The acetate is thick across the entire frame body, finished in high-gloss black with the cut lines visible at the corners.

Forty-nine-millimetre lens width, twenty-five-millimetre bridge, one hundred and forty-five-millimetre temples. Grey lenses sit deep in the bevel. The frame is a quieter geometric statement than the K-Series rounds or the wraparound H-Series silhouettes - architectural without theatrical.