Little Treasures Cube 2 x 2 Designer Speed Magic Cube Puzzle Adjustable 2 x 2 smooth turning brain cube, tighten or loosen the center screw to adjust the tension Standard structure comes pre-lubricated by the manufacturer, but the tightness is adjustable If the cube doesn't fit your style, just adjust the center screws Improves fine motor skills and dexterity while keeping them engaged for hours X 2 rotating speed cube is designed for starters and professionals