Growing in the tropical rain forest, it is the seed of a vine, which is precious because it is difficult to pick. Because of its hard texture and beautiful texture, it is suitable for playing in the hand, comparable to walnut, walnut and mahogany fitness balls. You can also carve patterns on it, which varies from person to person.

Specifications are mostly between 5-6 cm, and the texture is hard, such as stone. First, grind off a protective skin on its surface, then see a beautifully textured core, and then polish it, just like polishing Yin Shi and inkstone. Play is maintenance. After a long time, I feel better with patina. The older one can play single-player, and the younger one can play double-player, which can promote the blood circulation of hands and is good for the body.