Colorful plastic disks fit into top of NALGENE® cryogenic vial closure (1.2, 2.0 or 5.0mL vial).

Provide quick visual identification of specific vials to simplify inventory maintenance. Remain firmly in place during storage in mechanical and liquid-nitrogen freezers. Disks have cut-out top to facilitate handling of vials with forceps. Will not interfere with closure removal, vial handling or storage in boxes or canes. Flat surface permits writing on top of vial.