Boomerang is a curved, flat implement that is thrown as a weapon or for sport. Most boomerangs are made of wood or plastic. Most boomerangs measure from 12 to 36 inches (30 to 90 centimeters) long and 1/2 to 5 inches (1.3 to 13 centimeters) wide. Their weight usually ranges from 1 to 18 ounces (30 to 500 grams). Most boomerangs have a bend, called the elbow, near the middle that forms two wings shaped like airplane wings. Boomerangs used for sport typically have two, three, or four wings.