11mm Gold Seal, 1mm Thick Clear PTFE/Blue Silicone Septa, Ultra Low Bleed

11mm Silver Magnetic Seal, PTFE/Silicone/PTFE Lined

N 20 PE Cap for crimp neck vials with flat DIN crimp neck N 20 transparent, center hole Butyl beige/PTFE gray Hardness: 55° shore A Thickness: 1.3mm (unassembled) pack of 100

N 11 Aluminium crimp cap, red, center hole Natural Rubber/Butyl red-orange/TEF colourless Hardness: 45° shore A Thickness: 1.0mm pack of 100