Cryogenic Vials store valuable samples such as cell,serum and antibody safely. 50 Vials per package.CAP TYPE: Outer cap type and inner cap type (Slim Tubes are only outer cap type)CAP COLOR: White VOLUMES: .5mL, 1mL, 1.2mL, 1.5mL, 2mL, 4mL, 5mL Rounded bottom and self-standing bottoms.