SparkFun DEV-16524 Alchitry Br Prototype Element Board is a prototyping periphery for the Au or Cu FPGA development boards. This element board breaks out all the signals on the four headers running from the Au or Cu boards. The Br prototype element board features a large prototyping area with a 0.1″ pin grid for custom circuits. This element board is equipped with four connectors on top and four on the bottom for maximum stackability that snaps to an Au or Cu board.