Protoboard Shield for Arduino with mixed (2.54mm and 2mm) PADS Protoboard Shield for Arduino with just a bunch of soldering pads Works with Arduino R3 Seeeduino Freeduino Arduino R2 and older boards Includes a SOIC8 SMD pad 300+ soldering PADS separated at a standard 2.54mm (0.1") spacing and 2mm for XBee compatible pinout Only the PCB is included. You will need 2.54mm male or stackable headers to plug the shield to the Arduino board