"UltiGuard UltiCare Short Pen Needles 31 Gauge X 5/16" (.25mm X 8mm) 100 Pen Needles, Non-Pyrogenic, Non-Toxic. May be used as replacement needles for all Type A Insulin pen delivery devices including: Autopen, BD pen, FlexPen, Humalog Pen, Humulin Pen, In"