1m (3ft) MTP®-12 (Female) to MTP®-12 (Female) OM4 Multimode Elite Trunk Cable, 12 Fibers, Type B, Plenum (OFNP), Magenta US$ 43.00
Cisco QSFP-40G-SR4 Compatible 40GBASE-SR4 QSFP+ 850nm 150m DOM MTP/MPO-12 MMF Optical Transceiver Module US$ 39.00
FS 40GBASE-SR4 compatible QSFP+ optical transceiver works well on the Arista switch.