Vial Labels found in: Vial rack label kit for , Cryo-Lazr-Tag Cryogenic Laser Labels for Vial Tops, 0.433" circle, barcd label +ribbon for 2ml.. Cryogenic dot labels are ideal for labeling 0.2ml PCR tube tops, 0.2ml PCR tube caps, 0.2ml PCR tubes, 0.2ml PCR vial caps. caps.