We highly recommend storing HP Gel Pens in a fridge once received! This will ensure the longevity of the gel. When stored correctly the HP Pens can last between 6-9 months unopened and 3-6 months opened.
If you live in a hot area, we do recommend keeping the HP Gel Pens refrigerated opened and unopened. When ready to use, simply take the pens our a few hours prior to reach room temperature.