There is no mixing with the Norditropin Flexpro pen as the medication is premixed, prefilled and preloaded into each Norditropin Flexpro pen so that you do not need to mix, load or change a cartridge. The Norditropin Flexpro pen comes in a convenient compact size, and it has a unique ...
The silver tube sticking out of the end of the section in the OP's picture is the piercing tube. It is found on all Sheaffer C/C fountain pens. The cartridge or converter is a snug fit over this piercing tube - it has to be to have a good, ink tight seal. This can be suffici...
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