medical disposables - needles for insulin pen type, 31G, 0.25 mm x 5 mm, sterile, single use, safe and efficient, non-toxic, non-pyrogenic, compatible with all models of insulin pen, easy to use, nontraumatic, optimal treatment with maximum simplicity, non pirogenic, dark blue, compatible with all insulin syringe pen-type, easy to use, nontraumatic, boxes x100, code IN3105, todylaboratories®, CE mark