Science & Exploration Sets features: Made of premium material, it is practical and durable. Perfect as party game toy to bring your kids more fun. The screw matching toy is a funny parent-child interactive toy. It is a wonderful toy for building hand-eye coordination while simultaneously having a great time. Features-Color:Assorted Color-Material:Wood-Size: About29.00X13.00X11.00cm/11.40X5.11X4.32in Recognize the small parts encountered in daily life, and build small toys with novel shapes Every detail is very good, and it is also polished and rounded without chamfering, which is good for hands Made of premium material, smooth surface without burrs, it is safe for kids to use Only nuts and screws of the same color can be screwed together to exercise the baby's ability to test colors Exercise kid's hand-eye coordination and shape and color cognitive ability, always keep them active and happy.