DescriptionAs a kind of Chinese traditional puzzle game, Kongming lock carries with mysterious mathematical and physical principles. A really good tools for fostering kids, as well as adults logic thinking.A wonderful intellectual toy for spare time playing.Features- Color: As shown. - Material: Wood. - Size: About 7.4x7.4x3.8cm. - The Kongming lock is made by wood materail, safe for playing. - Relief stress, develop intelligence, hand-eye co-ordination skills, improve dexterity, foster logic thinking, parent-child interaction, prevent Alzheimer's and more. - Teaches dexterity and coordination. - This product aims at training kids imagination, eye-hand coordination. - Not only a toy, but also can be a ornaments for office and study room. - Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!