Stopper Stopper Size 00 to 7 Overall Height 25 mm Material Natural Rubber Product Type Stopper Set Color Black Autoclavable Yes Number of Holes Not Applicable 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 72