1.5 IN 1 City Construction Tyrannosaurus 86 pieces of parts (free screws are not included), With the use of a novel and interesting assembling way,It can assemble five small vehicles and one big cool model: Excavator, Bulldozer, Road Roller, Mixer Truck, Dump Truck and the City Construction Tyrannosaurus. It has golden and purplish red for children to choose. 2.Rolling Wheels Painted in bright colors to stimulate the children's color perception, all vehicles also equipped with rolling wheels. Just a slight push, the vehicles can slide on a smooth floor or uneven ground for a long distance. 3.High Quality Constructed of safe, sturdy, durable and environment-friendly material ABS and the rounded edge design, the set is very suitable for children over 3 years old and they can play for fun without the accompany of parents. 4.Stunning Device Press the button under the dinosaur’s neck, the dinosaur will emit a realistic sound and bright flashes to attract the child's attention and create endless fun to them. 5.A Hidden Part,where is the screwdriver? More notably, the set includes a hidden part, the screwdriver, which the child needs to find and use to assemble and disassemble the dinosaur. In this way, children can not only develop their intelligence and logical thinking, but also exercise their hand-eye coordination and manual skills. 6.Attractive Packaging The attractive packaging makes the set more suitable for children as a perfect gift, more valuable for everyone to collect. The set included 5 engineering vehicles, is very suitable for children to play individually or with friends and parents together, which is conducive to cultivate teamwork ability and enhance parent-child relationship. 7.Special Functions During assembling and disassembling the set, children have to solve the proportion, symmetry and other mathematical problems and they can create scenes to tell their own stories, which is very helpful for children's early learning and storytelling ability.