3 Blue Syringe Shaped Pens Infected with the Zombie T-virus 3 Blue Syringe Shaped Pens infected with the Zombie t-Virus 3 syringe shaped pens with blue liquid "T-Virus" inside, pens write in Black ink Press the plunger at the top to 'activate' the pen, there is a small switch at the top to 'deatciate' the pen As with all the Zombinc range you have a 30 day satisfaction guarantee, if you are not 100% happy with your item within 30 days of receiving then you can return for free, please contact the seller for details.