Features: A variety of shape, enjoy unlocking. The tenon and tenon structured, which originating in ancient Chinese architecture, is very ingeniously. When assembling, you need to observe carefully, think carefully, and analyze its internal structured. It helps to develop Brains and flexible finger. Nice challenge to both adult and kids.Perfect gift as family game and gift for your kids. This one is so attractive that it can easily be used as a decoration in family room, working table, office, waitings room. These mental puzzle toy will challenge your intellects by stimulating amazing creativity. It requires careful observation and thinking, analyze its internal structured when assembling. Specifications: Material: Wood Size: As Show In Picture Note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color. Package includes: 9pcs/set Wooden Brains Teasers Puzzle