Tuloka Heat Sink with Heat Conductive Adhesive Sheet for Heat Exposure Prevention Cooling Radiator Fin Aluminum CPU IC Chip Circuit Board LED Amplifier 4 Pieces 40mm x 40mm x 11mm Heatsink for use with a variety of products. Provides heat dissipation for precision equipment, internal substrates, CPUs, etc. Heat Sink Size: 40mm x 40mm x 11mm (L* W* T) Material: Aluminum Color: Silver Thermal Adhesive Sheets: 4pcs Double-Sided Adhesive Heat Transfer Adhesive Sheet Glass cloth substrate, quick and even heat conductivity, thermal conductivity: 1.32 W/m-k heat transfer sheet size: 38 mm x 38 mm x 0.25 mm pre-cut adhesive tape is attached to the back of the heatsink.Easy to apply? Package: 4pcs * Heat Sink + 4pcs * Heat conductive adhesive sheet