SEALS ALUM FLIPOF20MM BLNKTP YLW1000 DS is a bulk pack of 1,000 aluminum vial seals featuring yellow flip-off caps. These 20mm seals are designed for serum vials with a 20mm crimp finish. The aluminum provides a secure crimp closure, while the blank yellow plastic flip-off cap offers tamper-evident protection and allows for custom labeling or clear visibility. Ideal for pharmaceutical packaging, these seals ensure vial integrity and easy access while supporting product identification through color-coding.