These opaque green polypropylene hinge top child resistant vials include squeeze top openings for added security when closed. The lids of the 19 and 30 dram sizes say "Squeeze Sides Below Cap", while the 13 dram size says "Squeeze". Each capacity also shows a double sided arrow, directing where to squeeze on the hinge top vials to open. The opaque green polypropylene material protects light sensitive products, while also offering a vibrant color that pairs well with labels. Be sure to test these plastic vials with your products to ensure compatibility.