SureSTART™ 20 mL Clear Glass Crimp Top Flat Bottom Headspace Vials, 1000/pack, Level 3. Catalog number: 6PCV20-1FT. 428.93 / Case of 1000. Add to cart. SureSTART™ Gold Magnetic Steel 20 mm Crimp Caps with Soft Blue Silicone/Clear PTFE Septa, 100/pack, Level 2. Catalog number: 6AMCC20-ST3. 139.65 / Pack of 100.