Specification： Material:plastic. Package include:36PCS Syringe Pens. Color of ink: black. T hey are 6 different colored fluids: red, green, yellow, blue, purple, transparent. Great for school projects, party supplies and favors for events like birthdays, Christmas, Halloween, and much more. These syringe pens are perfect as home and office decor or as school supplies for people of all ages. Perfect for role playing. Children can imagine that they are acting as a doctor, surgeon or a chemist in a medicalthemed party or a stage play.