Toddlers love to dump and fill, stack and swat...and this natural play introduces important preschool concepts. Later, they'll take pleasure in molding, stamping and sorting with these detailed pieces. Unique in design, our cups are volumetrically correct - the contents of cups 3 and 4 really do fill cup 7. Parent book suggests ways to keep the fun building...even up to simple math equations! Appropriate from 12 months - Primary School