The products come in an array of sizes: 2.5, 3, 3.5, 5, 7, 9, 12, 15, 20, 25, 40 and 50 Dram. With this many sizes, one can be confident to find the best-fitting snap cap vial. China Chromatography Sample Vials manufacturer, PTFE/Silicone . China Manufacturer 1.5ml 11mm Snap Top Glass Ring Sample Vials FOB Price: US $0.04-0.08 / Piece. Min.