Greek shields, known as aspis or hoplon, were large, round shields made primarily of wood and covered with bronze. They were designed to provide protection in battle, allowing soldiers, particularly the hoplites, to form a tight defensive line called a phalanx. The shields often featured intricate designs or symbols, representing the city-state or the warrior's personal insignia. These shields typically measured about three feet in diameter and were heavy, weighing around 20 to 30 pounds. The hoplon had a central handgrip and a shoulder strap, enabling soldiers to carry them effectively while maintaining mobility during combat. Their design played a crucial role in the effectiveness of Greek infantry tactics.