The Cisco STACK-T1-3M Cisco Stacking Cable is designed for use with Cisco 3850 and 9300 switches, providing a 3m cable length for easy connectivity. This powered cable is made in China and features a 1:1 connection split/duplication, ensuring reliable performance. The black cable is a genuine Cisco product, specifically manufactured for their networking equipment, offering a high-quality and secure solution for stacking multiple switches together.