Includes a permanently attached needle that is the only single-handed device available in 1/2 unit markings with a shielding mechanism. Ultra-Fine™ needles are designed to be thinner and smoother for a more comfortable and less painful injection. Electro-Polishing polishes away microscopic burrs, giving every needle a smooth finish while the Micro-Bonded Lubrication process creates more glide and less friction, and Fine-Point Technology shapes the tip of every needle as finely as possible for easier penetration using a three-step process.