2 mL, 10 mm, Screw Top Amber Vial with PTFE/Silicone Pre-slit Closure Kit PerkinElmer kits hold 100 2 mL Clear Screw Top Vials and 100 preassembled Black Caps with PTFE/Silicone Pre-slit Septa together in an environmentally clean, re-sealable clamshell pack.