DETAILS Sustainably Japanese made, black acetate sunglasses. Timeless shape that pays homage to 1960's frames. UVA/UBA protectant recycled lenses. Exposed arm window to show the silver metal core that runs across.  Our signature BK Star motif on the front hinge and the temple tips. Rivted hinge and silver foil BARE KNUCKLES logo on the inside arm. Custom leather hard shell case and cleaning cloth. INFO Made in Japan. Cat 3 Smoke Grey Lens or Cat 1 Butter Yellow Lens. 8 mm acetate thickness. SIZING 51-22-145 Lens Width - 51 mm Bridge Width - 22 mm Frame Width - 145 mm Temple Length - 145 mm SUSTAINABILITY Bio Circular Acetate 96% sustainable content (42% FSC source cellulose, 28% recycled acetic anhydride, 26% bio-plasticiser, 4% additives - color pigment and stabilizer). Certified biodegradable (meets ISO 14855 standards) 28% ISCC certified recycled content diverted from lanfills Recycled Metal Components (hinges and wire cores) Certified recycled steel Poly Renew Lenses Certified 50% recycled plastic Packaging Lens cloth and case are made with certified recycled PET (RPET) Carbon Emissions For every 1 frame that's made, 1 tree is planed to Eden Reforestation Projects to offset carbon emissions.