ONE-CARE DUO Safety Pen Needles provide ultimate solution for safe and convenient insulin injections. These pen needles feature automatic shielding of both injection and back-end needle before and after use, ensuring enhanced safety and virtually eliminating risk of needlestick injuries. A glass-clear shield allows for easy priming, while an audible 'Click' indicates activation. Optimal insulin flow, low trigger and insertion force is achieved thanks "Thin-Wall Technology", electro-polished and lubriccated needles. The ribbed main housing offers ergonomic design, and the red color visual indication distinguishes used and non-used devices.