BD Micro-Fine Ultra Pen Needles are compatible with all pen devices for diabetes treatment - 0.25mm (31G). The new Pentapoint technology features a patented five-bevel needle tip that is flatter and thinner than standard three-bevel needles for a smoother, gentler injection experience. It penetrates the skin more easily and can be inserted at 90°, without the need for a skin fold in most adults.