A dobby is a programmable shaft selector. It is the solution to the problem of limited space for treadles in a loom, which restricts the number of operable shafts. Moreover, weaving with a dobby is much more comfortable.
 
Mechanical Dobby:  A program bar with pegs system. The numbered holes in the program bars correspond to with the shafts of your loom. If you want a shaft to be raised, you place a peg in the corresponding hole of the program bar. The number of program bars forming the chain, can be adapted to the weave pattern. However, if the number of program bars becomes very large, you may want to consider an electronic dobby.
The Mechanical dobby comes with everything required for a mechanical dobby including 30 program / dobby bars and their pegs.
 
Electronic Interface: The electronic interface will give you almost unlimited shaft combinations usinga computer and softeare from Fiberworks PCW, Patternland, Weavemaker, WeaveIt, WeavePoint, WInweef or Pro Weave, which all work with the Louet electronic interface.
The electronic interface works with your own laptop to tell the loom which shafts to lift to create the weaving pattern.