... stone particles. Stone grain specification is 2mm 1-2-3-5mm 3mm 8mm, 5-8-12mm, 20 ... 80 mesh. The ball has MaiFan quarry for 2-4-5mm 3mm, 8-9mm.Introduction and usage: ... of history. Ming dynasty, is described in LiShiZhen medicine master in compendium of materia medica. Modern scientific analysis ... 30 kinds. Which selenium, zinc, manganese content is rich, it has obvious effect against failure, the three ...