The sb400 solder able pc breadboard enables you to transfer your circuit and wires from a plug-in breadboard without re cutting wires or changing your layout. the sb400 has the same pattern and spacing as a standard 400 connection point solderless plug-in breadboard. it has a standard 5-hole strip for each ic pin, just like solderless breadboards plus 4 power rails. however, it has the advantage that soldered joints provide a more reliable long-term connection than solderless contacts. the sb400 has four power rails like solderless breadboards, plus two bonus rails for power or signals. there are bonus two-hole pads along the centerline allowing dil (dual in-line) headers to be used. bps prototyping boards use high-quality fr4 glass epoxy pcbs for long life, with an anti-tarnish protective coating for easy soldering. bps boards are lead-free and rohs compatible.