1. Flexible and DurableMade of materials, these tapered silicone stoppers are flexible yet durable. They have good flexibility and hardness, strength and resistance to wear. With their dense structure, they are not easily breakable and can withstand temperatures up to 200°C 300°C. 2. Multiple Sizes and ColorsThis set includes 60 silicone stoppers in 8 different sizes and colors, providing you with diverse choices. The stoppers have a good fit for threaded or nonthreaded openings with an inner diameter (ID) of 1/16' to 5/8'. With this abundance of options, you can easily find the size and color to meet your specific needs. 3. Secure SealingOur silicone stoppers feature a smooth surface and insulation and sealing properties. They create a secure seal, effectively preventing leakage of liquids, powders, and gases. With their reliable sealing capabilities, you can trust these stoppers to insulate your containers from air and maintain the integrity of their contents. 4. Easy to Use and ReuseThanks to their tapered design, these silicone stoppers are easy to insert and remove. They are flexible and elastic, allowing for hassle usage. Additionally, they are easy to clean and can be reused for a long time without staining. With these stoppers, you can conveniently seal and unseal your containers whenever needed.