Luer Lock Insulin Syringes Components: BARREL, with finger grip. - Materials: medical grade PE (polyethylene) or PP (polypropylene); transparent for easy reading and for detecting air bubbles. - Cylindrical shape. - Graduation scale: clear, water resistant: for 2ml syringe every 0.1ml for 5ml syringe every 0.2ml for 10ml syringe every 0.5ml for 20ml syringe every 1ml - Ends in a male Luer tip (conical with 6% taper). Concentric for 2 and 5ml syringes. Eccentric for 10 and 20ml syringes.