Little Treasures Stickerless Blue Love Cube Adjustable corner cutting tension Cube 3X3X3 Puzzle 3x3 Hart shapes love cube Adjustable corner cutting tension (Tighten or loosen the center screw to adjust the tension - As shown in the instructions included). Standard structure comes pre-lubricated by the manufacturer, but the tightness is adjustable. If the 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 3 x 3 rotating speed cube is designed for Starters & professionals, 6 sided Magic cube is designed with 6 different bright colors, and corner flipping pieces to help solve the puzzle in a jam, now buy one to start the challenging puzzle!