Plastic Syringe Pens - Fun School Plastic Syringe Pens These Cool Ballpoint Pens are Just the Thing for Taking Notes in School. The Cartridge is Surrounded with Red Liquid That Sloshes Around as You Write With This Funky Syringe Shaped Pen. These Make Excellent Party Favors, Especially for a Ghoulish Halloween These Novelty Pens are Great Gift for Doctors and Nurses The Pens Are Sold Individually. They Write Easily and Smoothly