Specifications: Ball Diameter: 5.5mm/0.22 inches Ball Material: 304 Stainless Steel Dropper Bottle Capacity: 15ml/0.5Oz Dropper Bottle Size: 23 x 70mm/0.9 x 2.75-inch(D*H) Dropper Bottle Material: PE (Polyethylene) Package Contents: 100 x Balls 10 x Bottles Descriptions: High precision: Stainless steel balls hardness is less than HRC 26, weak magnetic, accurate size. Corrosion resistance: 304 stainless steel material, widely used in food machinery, precision instruments, hardware. accessories, valves, cosmetics and other highly corrosive products. Note: Make sure the dropper bottle temperature is below 65 degrees. The dropper bottle can not be used for corrosive, strong acid and alkali liquid.