Game of keys and locks

Age: +3; Country: China; Brand: World of educational toys; Packing: cardboard; Material: Wood; Box size, w / h / d: lock - 8.3*6.3cm, key - 6.5cm, 20pcs/box - 10 dots (reverse side number), 10 keys An excellent toy for learning counting. 
Fits every lock Only your own key, you can initially practice using the selection method, and then remembering which number means what. To add complexity, the numbers are written in English, which allows you to connect all channels of information perception at once. 
The image of the number of dots helps to better identify the numbers using visual perception. 

In addition, the locks are functional and then can become an excellent addition to role-playing games and quests!