The 91.7 mm tall, flint 50 ml is a premium, excellent-quality, clear (flint) FSSC 22,000 and food grade certified, 100% non-toxic and 100% lead-free, and microwave and dishwasher safe. The glass bottle is inert, unreactive, and does not leach chemicals into your product. The glass bottle is designed for packing cosmetic serums, oils, etc.