Salvaged Set of 4 Small Circuit Board
 
2-3/4 x 1-1/8"
1-3/8 x 1-3/8"
2.1/2 x 1-5/8"
2-3/8 x 1-3/8"
Some have holes available to attach things to it. Some, if not all of the bits and pieces can be removed    with a soldering iron. and wicking material. (salvaged material so may have scuffs, scratches or rust)
 
Caveat - working with circuit boards need to be approached with caution, if they are being cut,  protective gear should be worn (mask & googles) so as not the get particles where you don't want them. Finished artwork should be sealed if it will be worn or handled. Do your own research just to be safe. FYI I handle these without gloves so can't say whether the electronic properties of these are functional.