Delta Education Laboratory Rubber Stopper Set Size 2.5 NEW 3mm Hole Pack of 10

Features: ⭐ New-never used ⭐ Pack of 10 size 2.5 black rubber stoppers with 3mm center holes ⭐ Made from premium natural rubber for optimal sealing and flexibility ⭐ Tapered design for secure fit in laboratory glassware and containers ⭐ Ideal for laboratory work, home brewing, bottling, and DIY craft projects ⭐ Maintained in a smoke and pet-free environment Measurements: 📏 Size: 2.5 (standard laboratory sizing) 📏 Hole diameter: 3mm 📏 Package quantity: 10 pieces This professional laboratory stopper set is ideal for chemistry experiments, educational demonstrations, and scientific research applications. The tapered black rubber design ensures secure sealing for test tubes, flasks, and other laboratory vessels while the 3mm center hole allows for tubing connections and controlled experiments. These Delta Education stoppers are manufactured to meet laboratory standards and provide reliable performance for educational and professional use.