Stopper Stopper Size 0 Neck Size 19 mm Screw Closure Size 19mm Bottom Diameter 8 mm Top Diameter 13 mm Overall Height 25 mm Material Natural Rubber Product Type Stopper Color Black Autoclavable Yes Number of Holes 0 Standards Not Applicable Special Features Low Sulfur Content Withstand Temperatures From - 25 to 70 Degrees C (-13 to 158 Degrees F) Resists Abrasion and Water For Labware Type Erlenmeyer Flasks Test Tubes Liner Material Natural Rubber Package Quantity 170