Tek-Select® Peti-Vial/Biopsy Containers with 10% buffered formalin- 7mL containers offer a leak proof screw cap with a highly visible warning label. Containers are pre-filled with 3.5 mL of 10% buffered formalin. Peti-vials are excellent transport containers for Dermatology specimens and small biopsy specimen. Vials are available in bulk style packing or in organized styrofoam tray packages. Vials can also be purchased empty.