The K14 BRW is KUBORAUM's K-Series round mask in Mazzucchelli acetate (named in the original product data) cut from a sheet with deep wood-grain marbling - dark brown striations running through tan and amber undertones, structural to the slab rather than printed on top. Each frame catches a different stretch of the sheet, which means no two K14 BRW are visually identical.

Brown lenses warm the field of view by a quarter-stop. Fifty-millimetre round lens, twenty-one-millimetre bridge, one hundred and forty-five-millimetre temples. The acetate is thick at every edge - this is a substantial round, not a thin-rimmed minimalist frame.