This is a  Genuine Foundry 10G-XNPK-LR  (Black)

1310nm serial pluggable XENPAK optic only (SC) for up to 10km over SMF

Free Fedex 2 Day Shipping in the lower 48 States

Let me know if you have any questions M-F 9:00-5:00 PST or :

Here is a Link to more info from Brocade's Website : HTTPS://www.brocade.com/downloads/documents/data_sheets/product_data_sheets/Optics_DS_00.pdf