Package of 4mL amber glass, 1st hydrolytic class screw cap style vials with fill lines/label area. Comes with Screw Cap & Septa. Cap: 13mm polypropylene screw cap. Septa: Silicone (Cream)/PTFE (Red), 55° shore A, 1.5mm, Vial Deminsions: 4mL, 45 x 14.7mm, 13mm screw cap, Package Size: 500/pk