uxcell Aluminum Heatsink Radiator Heat Sink Cooling Cooler Fin 40mm x 40mm x 11mm 4 Pcs Black Product Name : Heatsink;Material : Aluminium Color : Black; Weight : 71g Overall Size : 40 x 40 x 11mm/ 1.6" x 1.6" x 0.43" (L*W*H) Package Content : 4 x Heatsink The fins increase the area of the board and thus provide for greater heat transfer.