PerkinElmer. Top Vials and 100 preassembled Black Caps with PTFE/Silicone Pre-slit Septa together in an environmentally clean, re-sealable clamshell pack. Volume: 2 mL Size: 12 x 32 mm I.D.: 10 mm Finish: Screw Top with Closure Kit Description: Amber glass vial PTFE/Silicone Pre-slit Septa with Black Cap.