BD Ultra-Fine Pen Needles - 29G 1/2" 90/BXBD Ultra Fine Pen Needles 29G 1 2" 90 BX The BD Ultra Fine original pen needles are designed for safety and of course comfort. These 29 Gauge Ultra Fine pen needles are BD's widest inner diameter pen needle available. They're a good choice for people with any dexterity problems or people who need larger doses. The wider inner diameter pen needle makes pressing the push button and administer insulin simpler. BD Ultra Fine Pen Needles Features: