Mongol horses are of a stocky build, with relatively short but strong legs and a large head. They weigh about 600 lbs. and range in size from 12 to 14 hands (48 to 56 inches, 122 to 142 cm) high. Their cannon bone external circumference is about 8 inches (200 mm). They have a slight resemblance to Przewalski's horse and were once believed to have originated from that subspecies. The mane and tail of the Mongol horse are very long. Their strands are often used for braiding ropes; the tail hair can be used for violin bows. Mongolian horses have great stamina: although they have small bodies, they can gallop for 10 km without a break. Because the horses are allowed to live much the same as wild horses, they require little in the way of hoof care. The hooves are left untrimmed and unshod, and there are few farriers in the country. Mongol horses have hard, strong hooves and seldom have foot problems. Sometimes, but not always, horses will be branded. Mongol horses are very strong. When pulling a cart, a team of four Mongol horses can draw a load of 4400 lbs for 50–60 km a day.