Bala

Bala (虚弾（バラ）, bara; Spanish for "bullet", also translated as "Hollow Bullet") is an Arrancar technique that hardens the user's reiatsu, and releases it from their fist like a powerful bullet. It's not as powerful as cero, but it's about 20 times faster. Its power also varies with the Arrancar and Espada. Some prominent users are Yammy, Wonderweiss Margera and even Ulquiorra Schiffer. The more powerful the Espada, the more enhanced Bala becomes.