The eunuchs in the Ottoman Empire were created mainly at one Coptic monastery, at Abou Gerbe monastery on Mount Ghebel Eter. The Coptic priests sliced the penis and testicles off Nubian or Abyssinian slave boys around the age of eight. The boys were captured from Abyssinia and other areas in Sudan like Darfur and Kordofan then brought into Sudan and Egypt. During the operation, the Coptic clergyman chained the boys to tables and after slicing their sexual organs off, stuck a piece of bamboo into the genital area, then submerged them in neck high sand to burn. The recovery rate was ten percent. The resulting eunuchs fetched large profits in contrast to eunuchs from other areas.