These dinosaur toys for all ages but especially for my 4.5-year-old are terrific. This toy is a take-apart dinosaur toy with w/a light sound, stem construction building style. This is cool and very easy to build and learn how to do simple coordination and using a screw gun and simple tools.Well-made and fun to watch the boys play, my older son even likes it and is teaching my younger how to set up these cool dinos, they are tyrannosaurus rex, dilopgosaurus, styracaceous, triceratops. They look like the real thing and are very realistic dinosaurs that roar and led lights to add to the fun get to playing with these dinosaurs for hours of fun.Got these for my son's fifth birthday. He had a blast putting them together but they don't stay together, despite me making sure screws were tight after he put them together. So we are constantly losing screws even though he's not the type of kid who is rough on his toys and his brother, who is rough on toys, doesn't play with these.His raptor came with two left legs. He had to choose between putting the leg part on inside out or having the foot face backwards. He chose to have it inside out so at least the feet face the same direction. Doesn't really bother him but I know from experience with one of my others (who has autism) that a backwards leg would be a huge issue for some children.Pterosaur also came with a broken leg. It just flops around loosely, so it can't stand up. Again, he isn't bothered but some children would be.Needs a lot of hands on assist for 3-4 year old. I think 5 would be a more appropriate ageNice toy. Makes a good gift. It provides hours of fun for my grandson who is 5 years old. But some parts like the necks break easily but other then that it's pretty goodMy grandson is 4 and loved putting these together VERY close adult supervision on this because the screws are small and they do fall out even when he is playing with them. Love the different dinosaurs in this collectionIt is very simple for children to install by themselves, and it is beautiful to place on the deskI bought the dinosaurs for my grandson he’s four loves playing with toys and tools