2 mL, 10 mm, Screw Top Vial with PTFE/Silicone Pre-slit Closure Kit. PerkinElmer. 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:Clear glass vial PTFE/Silicone Pre-slit Septa