This is a pack of ten 2" × 2" prototyping boards each of which supports an 88-lead Chip Scale Package (CSP) or 88-pin QFN IC with 0.4mm pitch.
It also has space for some 0603 parts.
This product utilizes the patented Schmartboard|ez technology to make soldering surface-mount devices easy. Your SMT part will sit in grooves that hold it in place and already have solder in them. So all you need to do is put a chip in the grooves, apply flux, and use a small enough soldering tip.
Also available in single quantity.