... 2,Material: Germanium 3,Color: Silver-grey 4,Surface finish: 80/60 Germanium Stone (99.9%) 1), Material : metal germanium 2), Specification: Φ3mm ... ;Φ4mm;Φ5mm;Φ6mm;Φ7mm; Φ8mm; Φ10mm;Φ12mm.3), Surface finish : 80/604), Purity : 99 ... , welcome to visit our website: www.shhxgd.com Ge. Stone(99.9%)