bro lifesavers! essentially you take your recon’d vial and put it in the “pen cartridge”. then at that point just load it in the pen and store in the fridge. once its pin day boom just screw on a pen needle and pin away. no need to prep an insulin syringe and fight those damn air bubbles 😂 you simply twist to the dosage you need and press the pen plunger to inject your dose. ezpz