90pcs Adhesive Aluminum Heat Sink Cooler Kit For Cooling Raspberry PiDescription The Heatsink have a layer of adhesive on the back of them Simply peel the adhesive off and stick onto your boardThis heatsink set is specially designed for Raspberry Pi its function is to cool down the board and make your Raspberry operate safelyReduce the risk of hardware failure because of overheatingInstall instructions Make sure the chip modules are free from dirt and greasePeel the protective liner on the base of the heatsinkAffix the heatsinks on the chip modules and apply firm pressureOne set of aluminum heatsink 3pcs 1 x 14mm L x 14mm W x 5mm H Heatsink for Soc1 x 9mm L x 9mm W x 4mm H Heatsink for Voltage Regulator1 x 9mm L x 9mm W x 4mm H Heatsink for LAN9512Package included 30 set of aluminum heatsink 3pcs