The wood-block, block of wood or Chinese box (in the toolbox Orff), is a musical instrument made of wood of a solid body with a longitudinal slot, which can be produced in various ways. The Wood-Blocks MISSOM® are cobbled, and have the particularity that they may be retuned, in the case of a well defined idiofone tall. The Wood-Blocks MISSOM® can also be produced in various woods, but hard-maple is being the most used and that offers better results from low to high consistency, and constancy enough on its density, allowing better control tuning. These instruments can be sold loose or in sets of five units, ready to be played in sets multipercussão as in works like 'Rebound' by Iannis Xenakis. Parallelepiped dimensions varied between 2,36 X 2,76 X 2,36 X 5,12 inch and 4,33 X 12,8 inch.