Chopsticks are shaped pairs of equal-length sticks that have been used as kitchen and eating utensils in virtually all of East Asia for over two millennia. First invented and used by the Chinese during the Zhou Dynasty, chopsticks later spread to other countries across East, South, and Southeast Asia including Japan, Korea, Cambodia, Laos, Nepal, Malaysia, Myanmar, Singapore, Thailand and Vietnam. Chopsticks are smoothed and frequently tapered and are commonly made of bamboo, plastic, wood, or stainless steel. They are less commonly made from titanium, gold, silver, porcelain, jade, or ivory. Chopsticks are held in the dominant hand, between the thumb and fingers, and used to pick up pieces of food.