The Espada are comprised of ten Arrancar with exemplary strength. Members of the Espada are given a number from 0-9. The lower the number, the more Reiryoku the Espada has. Each Espada has a tattoo with their number somewhere on them, such as Grimmjow Jaegerjaquez, whose tattoo is on his lower back, and Coyote Starrk, whose tattoo is on the back of his left hand. Along with Sōsuke Aizen, Gin Ichimaru, and Kaname Tōsen, the Espada as a group possess comparable strength to Soul Society's Gotei 13 Shinigami captains.