This is a cute half-size breadboard, good for small projects. It's 2.2" x 3.4" (5.5 cm x 8.5 cm) with a standard double-strip in the middle and two power rails on both sides. You can pull the power rails off easily to make the breadboard as thin as 1.4" (3.5cm) and stick it onto an Arduino proto-shield. You can also cut these in half with a saw to create 2 tiny breadboards, or "snap" these breadboards together, either way, to make longer and/or wider breadboards.