印度采购需求：AMPS、船用岸电系统、EGCS（废气净化系统）、洗涤器备件、船用电缆、光纤电缆

I'm looking for a high-quality tri-axial cable with a 50 Ohm impedance. Key specifications include tinned copper stranded wire, a core insulation of PE, and dual C-shields with significant coverage. The outer diameter should be approximately 6.40 mm, and the sheath needs to be TPE-U, halogen-free, and cut-resistant. Additionally, please ensure that the product is resistant to both seawater and tap water. The attenuation value should be determined post-production, and I'm interested in a sleek black color similar to RAL 9005. The overall design is crucial, including a shortening factor of 66%.