WINGONEER&reg; Prototype PCB for Arduino MEGA 2560 R3 Shield Board DIY PCB Dimension: 101.6mm x 53.34mm / 4" x 2.1"; PCB Thickness: 1.6mm Material: high quality FR-4 glass fiber PCB All holes are plated through; Dual copper layers. Pads grid (pitch) 2.54mm / 0.1", hole diameter 0.9mm. Note: This is not original Arduino product.it only a substitute accessories from WINGONEER