The product in display is Black Cotton Cord. Size: 0.5 mm thick (100 Mtrs). Round wax cords or polished cords are basically cotton braided cords with round cross sections. Various strands of cotton yarn of different counts in sheath and core are braided together (either in single head or double braid) to give them the lateral stability. Braided cords are then processed in AZO free chemicals to impart aesthetic look of leather .The color tone of products you see on your mobile / computer screen may vary from actual product due to lighting effects, monitor's brightness / contrast settings etc.