Follow the simple instructions on the back of the box and you will be rewarded with a lifelike brain gelatin dessert. The mold is 9" x 7" x 4" (22.7 cm x 17.8 cm x 10.2 cm) and made of non-toxic green plastic.  It comes in an illustrated window box.
— Mary Porter Green, owner of Curiosity Zone in Ashburn, Va., told TDmonthly in a December 2013 survey brain molds are one of their best-selling Halloween toys.