Caps, Crimp Top, with 1.3mm thick, Silicone / PTFE, ultra-clean, Pre-Slit Septa, fitted in aluminum, Silver Caps with a 4mm center hole. For use with 8mm Crimp Top autosampler vials. MicroSolv Brand. 100/PK.
Pre-Slit easier for the needle to penetrate the septa and offers minimal resistance. It may not reseal as well as other Non-Slit Septa.