The Espada are comprised of ten Arrancar with exemplary strength. Members of the Espada are given a number from 0-9.[1][2] The lower the number, the more Reiryoku the Espada has.[3] Each Espada has a tattoo with their number somewhere on them, such as Grimmjow Jaegerjaquez, whose tattoo is on his lower back,[4] and Coyote Starrk, whose tattoo is on the back of his left hand.[5] 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.