It is a set of three heatsinks for the Raspberry Pi that are appropriate for use with applications. The third one serves as a backup. Just remove the backing and adhere it to the top of the IC, and you're done.
10pc Silver White Aluminum Heat Sink Electronic Router CPU Small Heat Sink Block
Width 20-120mm Aluminum Heat Sink Cooler PowerTransistor Heat Dissipation
Large Aluminum Heat Sink Excellent Condition 350x300x15mm (t= 4mm) USED
40mm × 14mm × 7mm Aluminum Heat Sink with Thermally Conductive for IC Chip PCB
LED Cooling Aluminum Heat Sink Dissipation 120mm × 82mm × 5mm
