Pure copper Heatsink For Raspberry Pi ，than aluminum effect much better You can keep your Raspberry Pi cool by installing these heatsinks. Perfectly for raspberry pi size 2pcs 13 * 12MM Pure copper size 1pcs 8*8MM aluminum You will be received 2x Pure copper Heatsink for Raspberry Pi 1x aluminum Heatsink for Raspberry Pi one for the CPU Broadcom BCM2835 one for the Ethernet/USB chip one for the voltage regulators 3pcs enough cool