Little Treasures Cube Twist and Turn Puzzle, 3 x 3 x 3 Stickered Cube Adjustable regular sized cube 3 by 3 corner cutting tension, tighten or loosen the center screw to adjust the tension Standard structure comes lubricated by the manufacturer, but the tightness is adjustable for the If the regular sized cube doesn't fit your style, just open the center caps and adjust the screws Challenge their young mind with puzzle cubes, improves fine motor skills and dexterity while keeping them engaged for hours