Shrink wrapped sterile plastic serum vials. 3ml 5ml 10ml and 20ml. Unsealed and unstoppered. Sterile PETG Plastic Serum Vials - Crimp Neck Finish - NALGENE. 3ml, 5ml, 10ml and 20ml plastic "tubing shaped" serum vials - sterilized by gamma radiation PETG is a "clear as glass" alternative to regular borosilicate glass vials