Product Name: Ming lock / Luban lockMaterial: natural woodSpecifications: 6*6cmWood Number: 6Brief introduction: Kongming lock， also called gossip lock， Luban lock， is Chinese traditional civil building fixation device， which originated in the first tenon joint structure in Chineae ancient buildings. Kong Mingsuo is based on the principle of the gossip， widely spread in the folk. In recent years ，it gradually gets people's attention. it's helpful in relaxition， brain development and flexible fingers and is good for all ages.