Raspberry Pi Model B+ Premium Aluminum Heatsink with Micro Fan Reduces the risk of hardware failure because of overheating. If you are into overclocking your Pi, this is a must. Heatsink kit includes will the following: 1 pc. LAN9512 heatsink : 10mm(L) X 10mm(W) X 10mm(H); 1 pc. SoC Heatsink : 14mm(L) X 14mm(L) X 10mm(H) Wiring instructions included