Owen Mumford USA Inc Unifine® Pentips® Short Pen Needles 31G x 8mm Needle LengthUnifine Pentips are ultra thin pen needles with a silicone lubricating coating designed for maximum comfort. They fit quickly and easily to virtually all insulin and non-insulin delivery pens including Owen Mumford's own Autopen. The tip of the needle is triple sharpened allowing optimal injections and greater comfort. Anti-coring treatment at the rear of the needle for clean piercing of the insulin cartridge, with noFragmentation.