Medicore Insulin Pens & Accessories Case 535 by Medicore Medical Supply GROUP: Needles & Syringes:Syringe/Needle Combo's:Insulin Standard Item Description: Insulin Pen Needle, 31G x 6mm (�'), 100/pk, 12 pk/Case Packaging Desc: Needle Insulin Pen 31Gx6Mm100/Pack 12Pk/Case Country of Origin: Harmonized Tariff Code: Product Description: