The Ottoman Empire used mail armour as well as mail and plate armour, and it was used in their armies until the 18th century by heavy cavalry and elite units such as the Janissaries. They spread its use into North Africa where it was adopted by Mamluk Egyptians and the Sudanese who produced it until the early 20th century. Ottoman mail was constructed with alternating rows of solid links and round riveted links. The Persians used mail armour as well as mail and plate armour. Persian mail and Ottoman mail were often quite similar in appearance.