Source google image: http://www.eureka-puzzle.eu/eureka/images/12_customer_section/HQ_Pictures/hq_pictures_473120_3D_Bamboo/473125%20doublecross.jpg
Eureka 3d puzzle
Source google image: http://www.eureka-puzzle.eu/eureka/images/12_customer_section/HQ_Pictures/hq_pictures_473120_3D_Bamboo/473125%20doublecross.jpg