This is a medium sized solderless breadboard, made from near translucent plastic. It has 2 power buses, 30 columns, and 10 rows - a total of 400 tie in points. All pins are spaced by a standard 0.1". The two sets of five rows are separated by about 0.3", perfect for straddling a DIP package over. The board accepts wire sizes in the range of 29-20AWG.
This board also has a self-adhesive on the back. The boards also have interlocking parts, so you can hook as many together as you'd like.
These breadboards are the perfect size to be used with the Board-ganizer