Custom designed kippah, also known as a yarmulke, made out of 100% cotton. It features elements of the Periodic Table for the Chemistry buff that you love! This unique, lovingly handmade kippah is lined with 100% cotton fabric. It measures a generous 10 inches in diameter for a very comfortable and secure fit for kids as young as 2 years old to adults. Thank you for looking! *Note* This listing is exclusive to the Periodic Table design kippah; other kippot pictured are solely to showcase other items I have made.