Primal Gladiator's Copperskin Gloves is part of the transmog set Primal Gladiator's Ironskin Armor (Monk only), which the Appearances collection lists in 2 versions. The other 13 pieces:
Items Numbered Next to Primal Gladiator's Copperskin Gloves
Blizzard numbers items as they are created, so the named items next to ID 115887 (115882 to 115892) were usually added in the same batch as Primal Gladiator's Copperskin Gloves: the same quest line, zone, vendor or reward set.