In Wrath of the Lich King it is item level 226 and requires level 80. In MoP Classic it is item level 200, requires level 80 and sells to vendors for 1c.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Heroes' Frostfire Gloves Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Heroes' Frostfire Gloves suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Heroes' Frostfire Gloves is part of the transmog set Heroes' Frostfire Garb (Mage only). The other 12 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Heroes' Frostfire Gloves Fits
Other Items Named Heroes' Frostfire Gloves
1 other item in the current build is also called Heroes' Frostfire Gloves. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 39495 (39490 to 39500) were usually added in the same batch as Heroes' Frostfire Gloves: the same quest line, zone, vendor or reward set.