6mm: IME-Fine Pen Needles (31G x 6mm) 8mm: IME-Fine Pen Needles (31G x 8mm) Pressurising insulin The longer the needle is, the harder it is to ‘pressurize’ the insulin through; so it needs a bigger ...

When a needles measurement is 31G, the G (or g) refers to the gauge of the needle. This donates the thickness, size, or capacity. The gauge and needle length will contribute to perceptions of pain ...

The counterfeit batch is Novofine Needles 31G (0.25mm x 6mm) with the lot number 08J02S, the Medicines and Healthcare Products Regulatory Agency (MHRA) said in a statement.