I-xun Speed Magic Cube Set of 2x2 3x3 4x4 and 5x5 Stickerless Puzzle Cube Bundle (4 Pack) 4 QiYi smooth stickerless magic cubes for beginner to advanced. Rounding chamfer design make more smooth and speed. Made of plastic harmless to your family and environment. Perfect for testing your mental skills and challenging your patience. If any problem please contact us in time,we will solve in 12 hour.