Cisco - Expansion module - 10 GigE - 2 ports + 4 x shared SFP - for Ca

Cisco - Expansion module - 10 GigE - 2 ports + 4 x shared SFP - for Catalyst 3850-12 3850-12X48 3850-24 3850-48 C3850-24 (C3850-NM-2-10G=)