Cap: Aluminum 20mm Crimp Cap. Septa: Silicone (White)/PTFE (Beige), 45° shore A, 3.2mm, Vial Deminsions: 20mL, 75.5 x 22.5mm flat bottom, Package Size: 100/pk Nonmagnetic Cap. Flat bottom vials are not to be used with HS-10 or HS-20. Use part number 220-97331-53 for HS-10/20.