White PTFE/White Silicone Septa, 20mm Pressure Release Headspace Aluminum Cap, 9.5mm Centre Hole: SC209204: White PTFE/Blue Transparent Silicone Septa, 20mm Crimp-top Aluminum Cap, 10mm Centre Hole for 6ml Karl Aijiren Tech Vials: SBC201202: White PTFE/White Silicone Septa, 20mm Crimp-top Blue Magnetic Aluminum Cap, 8mm Centre Hole