500pcs 20mm Aluminum Crimp Caps PTFE/White Silicone Septa for 6ml/10ml/20ml Vial
20mm Closure Size, Aluminum Crimp Seal with Natural PTFE/White Silicone Septa for Headspace Vial (Case of 100). Top/cap Type 20mm Crimp top. Silicone Colour white. Cap Colour Silver. HPLC Extractables Text No detectable peaks.