Each set comes with 12 monthly acrylic discs. They are 4 inches in diameter. These are great photo props for monthly baby photos. These come in 6 different color combinations or if you would like them all to be one color, please let me know.This set would make a great baby shower gift!Care Instructions: To clean  gently wipe with a cloth. Please avoid getting the product wet.Safety: This is not a toy so please avoid leaving your child unattended with this product.