Perfume Studio Graduated Glass Droppers - Pack of Six Replacement Droppers, No Bottles - Plus Free Perfume Sample Vial (7 x 75 mm - 1oz) Perfume Studio Brand Calibrated Droppers - Pack of 6 Calibrated Glass Pipettes with No Bottles - Plus Free Perfume Sample Vial Ideal for essential oil blends - Accurate Measurements Reusable and Durable, Fits 1oz Boston Round Bottles with 20/400 Neck Closure. Use for measuring liquid formulas Straight tip glass pipette, printed with .25, 0.5, .75 and 1.0 mL calibrations.