Quadra Magic Materia/Final Fantasy VII

The Quadra Magic Materia allows the equipped player to cast a spell or summon in the materia paired to it four times in a row at the same MP cost as having used that spell or summon once.

While it can be paired with the Master Summon Materia, Quadra Magic does not grant extra summons when Knights of the Round is used, nor does it work if the Knights of the Round Materia is equipped directly.