Akineko Heatsink Aluminum 6 PCS Cooling Kit Aluminum Heatsink Cooler Cooling Fin for WiFi Routers with Thermal Tape - Heat Sink Aluminum 22.5mm/0.87in x 22.5mm/0.87in x 5mm/0.19in.

The heatsinks themselves were exactly the right size for the application I needed, and are exactly as described and presented, which is why I'm giving the 5 star review.That said, I can't vouch for the thermal properties of the double coated tissue tape (same as shown in one of the product pics) since I used them with my own thermal pads. From what I can discern, 9488A focuses on good holding power at high temperatures. The 0.15mm thickness probably won't impede heat transfer too much but I wouldn't use it for mission-critical heat dispersal. If both adequate thermal properties and tackiness are required, I would recommend investing in proper thermal tape.

Do not use the tape included with this product. It will damage your equipment. The included tape is thermally insulating.3M 9448A is a "Double Coated Tissue tape". The product description says I would receive a "3M Thermally Conductive Adhesive Tape". Search the internet for "3M ID IBGeGTMLDPR0022" and you will find the manufacture website which describes the use of this tape as "Adhering, joining, affixing, bonding, mounting, holding, laminating, and attaching".The surface of the heatsinks is heavily scored from manufacturing which will reduce the thermal conductivity of the product. You will need to lap the heatsink to make it reasonably useable (sand and polish).

These heatsinks are very low quality, I'm using them on mine network switch as it was getting hot but they just fell off, Will invest in some proper ones.

My Raspberry Pi 4's were getting a bit toasty in their cluster. These heatsinks are perfect for helping to cool the processor.Under heavy load you will probably need active cooling, but for general use these work perfectly.