40GbE QSFP+ to 4 SFP+ Breakout Twinax Cable, QSFP-4SFP10G-CU3M Direct Attach Copper Cable; 30AWG Copper PVC Jacketed 3m Cable, Zinc Alloy Shell; Used in 10G/40Gigabit Ethenet, InfiniBand SDR, DDR, QDR, Switches, Routers, and HBAs,Data Centers; Comaptible with Cisco, Ubiquiti, D-Link, Juniper, Huawei, Mellanox, Compatiable for Mikrotik and Supermicro; In Wiitek's Signal Integrity Lab, we 100% passed TDR & VNA tested. And each DAC Cable is individually tested on switches before delivery. Dust Cap Cover and Antistatic Bag Packaging, RoHs,CE,FCC Certificated.