Fisherbrand™ Solid Natural Rubber Stoppers Designed for laboratory applications, Fisherbrand™ Solid Natural Rubber Stoppers provide a reliable sealing solution with durable, non-porous construction. Their solid, red rubber design ensures chemical resistance and long-term usability. Features Made from natural rubber: Provides flexibility and durability Solid design with no holes: Ensures secure sealing for laboratory use Red color: Enables easy identification High hardness (46/55 IRHD): Maintains structural integrity Specifications For Use With (Application): Laboratory use Length (Metric): 28 mm Color: Red Diameter (Metric) Top: 26.5 mm Product Type: Stopper Hardness: 46/55 IRHD Quantity: 20/Pk. Diameter (Metric) Bottom: 23 mm Material: Natural Rubber