This small book for kids contains the story of Ratón Pérez (a mouse that in Spanish and Argentine traditions takes a present to the kids for a baby tooth that has fallen out) and the visit he pays to the city of Madrid together with King Buby I.
| Language | Spanish |
| Pages | 16 |
| Size | 11 × 10 cm |
| Cover | Paperback, full color |
| Interior | Colour |
| Editorial | Le Comte Editores |
| ISBN | 9789871636037 |
