The E21 BS is KUBORAUM's E-Series in 100% glossy black acetate (per the original product data). The silhouette is angular - more cat-eye/almond than mask - with the upper rim drawn into a slight peak at the centre. Around each lens, the acetate is cut into multiple parallel stepped ridges that create visible layered depth at the rim - this is the multi-layered sculpted surface KUBORAUM names in the source description.
Grey CR-39 lenses sit deep within the beveled rims. Internal spring hinges hold the temples at fixed width but yield to face shape. Lens width fifty-eight millimetres, bridge nineteen, temples one hundred and thirty millimetres. Handcrafted in Italy, Berlin-designed. Ships in a hard case with cleaning cloth and certificate of authenticity.