This professional magic cube is durable， compact and can be used in professional competition. Type: 4X4X4 Speed Cube. Difficulty: Moderate. Dimensions: Approx. 61X61X61mm/2.41X2.41X2.41''. Weight: Approx. 163g/5.75oz. It will bring super smooth operation and great joy to you. It's suitable for three years old people and up. If the cube is too tight or too loose， you can take off the center cap and adjust the screw to make the cube tighter or looser.