Unifine Pentips are designed to deliver less discomfort, during an injection, with a precision sharpened needle tips designed to reduce penetration force. Thin wall technology improves drug flow, aiding less thumb force and time to deliver the dose, reducing thumb fatigue. Anti-coring treatment, at the rear of the needle, provides for clean piercing of the drug cartridge with no fragmentation for effective drug delivery. Advanced silicone lubrication makes for a lower glide force which reduces friction between the needle and skin, for smoother entry and removal of the needle. 31 gauge needle length is 6 millimeters. There are 100 Unifine Pentip standard insulin pen needles in a box.