Sealing and leak-proof design: Protective vial caps are specifically designed for 3ml glass vials. Its superior sealing performance ensures liquid does not leak, effectively blocking air, moisture, and dust to provide comprehensive protection. Efficient classification system: We offer 4 colors of red, yellow, green and black, 4 of each color, which is convenient to quickly mark according to date, ingredients or priority.Vibrant color schemes significantly boost your efficiency during operation or organization. Safe material:Our vial cap is made of high-quality silicone material, ensuring safety, stability, and reliability. Its excellent elasticity guarantees a lasting seal. Easy to clean, it retains its original shape and functionality even after repeated use and washing. Easy to use: Simply align with the bottle opening and firmly to achieve a perfect seal. The edge design allows for effortless one-handed opening and closing. After use, rinse with clean water and air dry naturally to prepare for use. Full scene compatibility: You receive 16 silicone vial caps in 4 different colors, perfectly compatible with standard 3ml glass vials. It is an ideal solution for organizing and storing small-volume liquids such as various reagents, model paints, essential oils, and more. Nkiy 16 Pack 3ml Glass Vials Protective Vial Caps,4 Assorted Colors of Red, Yellow, Green and Black Package include : 16 x Vial Cap Protective Covers Specification: Color:Red, Yellow, Green and Black Size :Fit for 3ml glass vials Feature (1)Whether it's for medication or lab solutions, our reusable vial caps are specifically designed to help protect the remaining liquid in an open 3ml vial. These caps help to bolck dust, leakage, and evaporation, ensuring that your vials and your contents remainfresh. (2)These vial caps are perfect for more than just lab use. Whether you're storing essential oils, DIY samples, or anything else in small vials, these caps the contents remain secure, dust-free, and ready for your next use. Note: Pictures are for reference only, please refer to the real thing. Material: Silicone Package Contents: 16*vial caps Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.