Owen Mumford’s Unifine Pentips Pen Needles 31g, 3/16 inch (5mm) are ultra-thin Diabetic pen needles that are triple sharpened at the tip allowing for optimal injections. Pen needle also has a unique silicone lubricating coating for maximum comfort.Unifine Pentips Insulin Pen Needles feature a variety of great advantages over other insulin Pen Needles brands. Pentips pen needle features OptiFlow and DiamondPoint technologies designed to deliver lower penetration and glide force for a more comfortable injection experience. Diabetic pen needles also have anti-coring treatment at the rear of the needle for the clean piercing of the insulin cartridge, with no fragmentation. This Unifine 31 gauge, 3/16 inch Pentips are our thinnest needles ever!