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Silicone stoppers tapered from 37 mm to 41 mm OD, suitable for sealing Erlenmeyer flasks, test tubes, and other laboratory glassware, meeting the needs of daily experiments, teaching, or scientific research Made of silicone, it is soft, durable, and corrosion-resistant, ensuring long-term use Features a built-in ground-inner joint design for a tight, gas-tight seal, effectively preventing liquid leakage and evaporation Note: this is not a food-grade material; the silicone has elasticity, and manual measurements may have tolerances; please refer to the actual product specifications Warranty: 1-year coverage period for your peace of mind, if received damaged, please let us know and we will solve it promptly