Cap, crimp, silver aluminum, certified, thin PTFE septa, 11. Cap, crimp steel gold, magnetic, white silicone/PTFE septa, 11 mm, 100/pk. Cap size: 11 mm A- $89.99 Aijiren 2 mL crimp top vials are constructed from Type 1 borosilicate glass, with low metal content, to protect your sample from destabilizing or leaching. Get Price.