Only the big carrier truck is inertial; small cars are non-friction for safe pretend construction play. 6-in-1 Complete Construction Scene Playset: This WEOLULI kit includes 1 friction push & go storage truck, 6 rolling mini construction cars (excavator, mixer, road roller, forklift, wheel loader, dump truck) and 8 traffic road signs. Suitable toy trucks for boys & girls ages 3-8 Safe Sturdy Toy Trucks: The transport truck features premium alloy front cab for realistic heavy-duty texture.