Vials Cap Septa for GC HPLC - 2ml Aer Sample . Suitable for 10ml Vials headspace vials aslo Additional InformationPackaging Details20mm x 3mm White PTFE/Silicone Septa with Alu Crim suitable for 10ml & 20ml Headspace vials required for GC; 20mL, Clear Glass, 22.5*75mm, 20mm Square Rim, Flat Bottom, Crimp Top Headspace Vial,100pcs/pk.