Introducing the Plasticoid VWR Rubber Stoppers, designed for reliable sealing in laboratory settings. These solid rubber stoppers are crafted from high-quality materials, ensuring durability and resistance to various chemicals. With a size of 7, they fit securely in standard lab glassware, preventing contamination and evaporation. Ideal for use in experiments, storage, or sample preservation, these stoppers provide a tight seal that you can trust. Whether you're a professional scientist or a student, the VWR Rubber Stoppers are essential for maintaining the integrity of your work. Elevate your lab experience with this dependable accessory!