Your search for "sm-x" revealed the following:
NEW Cisco WS-C2960L-SM-16TS Catalyst 2960L 16x 1GB RJ45 2x 1GB SFP Switch
SKU: NSN-5447
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco WS-C2960L-SM-48PS 48x 1GB PoE+ RJ45 4x 1GB SFP Switch
SKU: NSH-4388
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days