"I Got My Flu Shot Did U?" Pin-Back Buttons, 10-Pk. Promote, Encourage & Support Vaccination! Provide these High Quality, Fun, Bright, Colorful, Durable, Reusable Buttons! Give away gifts that will make a difference during flu season and will recommend others to get vaccinated. High Quality Pin-Back Buttons. Give to employees, patients, students, teachers, children, and more! Bright Colors, Animated Round, 1.5", Made in USA.