This product is either discontinued or we cannot get that from suppliers.
Aten XDACBL3M Ethernet Sfp+ Twinaxial Cable, Speed 10GBase, Wire Gauge 30 AWG, Copper, Form Type SFP+ to SFP+, Length-3(m).
The 10G SFP+ Passive Direct Attach Copper Twinax Cable provides a cost-effective way to establish a 10-Gigabit link between SFP+ 10G ports of switches within racks and across adjacent racks.