This shield is a double sided Arduino compatible unit, based on a very popular design by Majenko Technologies. The prototyping area comprises of paired holes, which is an extremely useful feature as many prototyping boards just have single holes. A board with single holes can make connecting wires to components a real pain. However, with paired holes, you now have somewhere to solder the component and solder a connection wire. The paired links are exposed which means you can easily break them if required. In addition, the board has a collection of surface mount pads on each side with break out areas making this a very comprehensive shield indeed.