Crayola Model Magic Bulk, Clay Alternative, 75 Count Classpack, Assorted Colors The Model Magic Classpack includes 21 (1 oz) white packets and 18 (1 oz) packets each of red, yellow, and blue for mess free art projects. Its an easy alternative to modeling clay that remains lightweight and flexible when dry. Unlike other modeling materials, Model Magic doesn't crumble or stick to hands. Crayola Model Magic in bulk is perfect for teachers as classroom art supplies. Safe and nontoxic, ages 3 & up.