Paper Mate InkJoy Gel Pens, Medium Point, Black, 4 Pack

i gave 5 stars because the papermate inkjoy gel pen barrel not the ink. in my opinion papermate inkjoy gel ink is ok but its the tip function that stinks. im used to jetstream uniball and pentel energel and the papermate inkjoy gel pen barrel will except uniball pentel energel and jetstream ink cartridges and thats what i use the papermate pens for. so if i buy the papermate inkjoy gel pens. what i do is i throw away the ink cartridges and then i put uniball 207 ink cartridge inside or jetstream or pentel energel. they all fit perfectly. no hacking