A box contains 1 enchantment stone that can enchant costume equipment. A list of obtainable stones:
Lex Aeterna Stone(Middle)
Variable Casting Stone(Upper, Middle, Lower)
Experience Stone(Upper)
Also includes old enchantment costume stones.

[iRO Description]
A box that contains enchantment stones for costume equipment.
3 new effects are added, including Lex Aeterna Stone(Middle), Variable Casting Stone(Upper, Middle, Lower), Exp Stone(Upper).
It also contains the enchantment stones that pre-existed.

[Costume Enchant Stone Box 10]