Features. 1).Crimp caps provide a consistently secure seal. 2).Beveled top for maximum secure seal. 3).Choice of a pressure safety release cap at 45 psi. 4).10/20mL Clear /Amber Precision Crimp Headspace Vial, Flat/Round Bottom, 22.5*46mm. 5).PTFE/Silicone Septa Φ20*3mm Temperature Resistant -60-200 with 9mm thread.