Screw Top Vials: 8mm, 9mm, 10mm or 13mm vials with amber, clear, clear-write on choices. Septa: Non-Slit, Pre-Slit, Y-Slit, Cross-Slit, PTFE/Silicone Rubber/PTFE or Red Rubber / PTFE septa. Silanized - Vials that are Silanized matched to an assortment of Caps