BreadBoard-400 is a solderless (plug-in) breadboard with 400 connection tie-points (i.e. 400 wire insertion holes). It has 4 power rails. Solderless breadboards are great for building and testing new circuits because parts can be easily inserted and removed. They are completely re-usable. The BB400 has a 300 tie-point IC-circuit area plus four 25 tie-point power rails. The housing is made of white ABS plastic, with a printed legend giving numbers and letters for columns and rows. The internal contacts are phosphor bronze with a plated nickel finish.A peelable adhesive tape backing is provided for attaching it to a surface.BPS BreadBoards are Lead-Free and RoHS Compliant. Finished projects can be moved to a SB400 Solderable PC BreadBoard to make them permanent.