Big Jumbo Museum Dinosaurs: 12 Piece Dinosaur Play Set up to 9 inches long Big Jumbo Museum Dinosaurs: 12 Piece Dinosaur Play Set. This fantastic set of 12 jumbo dinosaurs features realistic detailing and they are just the right size for toddler's hands. Each dinosaur is named on it's belly for easy identification. Dinosaurs measure up to 9 inches long and stand up to 7.5 inches tall. Durable and washable, this Dinosaur play set is intended for children ages 3 years and up.