A speed cube from MoYu Meilong. A high-capacity well-rounded design for excellent fault tolerance. Any type of cube puzzle that needs to be turned and manipulated builds hand and finger strength which in turn helps will fine motor skill development. They also encourage visual reasoning skills, hand-eye coordination and patience. The 4x4 speed cube is most ideal for those who have mastered the 2x2 and the 3x3 Speed Cubes. Turn the squares on the cube until all sides have the same colour. The mechanical design results in a smoother, faster and more reliable play. Age: 8 years + Not suitable for children under three years old due to small parts, keep out of their reach.