Betel nuts are small in size and are round to oblong in shape. The fleshy outer husk is coarse and matures from green to yellow-orange and may also contain patches of red. Within the husk, there are layers of fibrous pale yellow strands surrounding a hard light brown seed or nut, which is the dried endosperm. When the husk is green and immature, the nut and surrounding fibers are soft, but when the fruit matures, and the husk turns orange-yellow, the nut and fibers become hard, wood-like, and firm