StarTech.com 10m 40G QSFP+ to QSFP+ Direct Attach Cable for Cisco QSFP-H40G-ACU10M - 40GbE Copper DAC 40Gbps Passive Twinax - Cable for Network Device, Server, Switch - First End: 1 x QSFP+ Network - Male - Second End: 1 x QSFP+ Network - Male - 40 Gbit/s - 24 AWG - Black