Guhui Heatsink for Raspberry pi 3 Model B B+ and Pi 2 Model B (3 pcs)

Only one of the heat sinks had actual thermal tape on them. And from what I could tell, only one of the heat sinks was actually copper. The other two were aluminum.

I just received this “copper” heat sink set. Just in handling the three heat sinks it was obvious that not all of them are actually copper. Using my trusty Bausch & Lomb measurement reticle and accurate scale for precious metal/gems, plus some calculations to estimate the specific gravities, I conclude the following compositions of the heat sinks:> CPU/GPU: material SG=8.9 : COPPER> LAN/USB: material SG=2.6 : ALUMINUM (probably Series 1000)> RAM: material SG=8.3 : BRASS (probably standard Cu/Zn, not Admiralty alloy)And, yes, I should have paid closer attention to the item photos, rather than only reading the text description.These heat sinks are better than no heat sinks, and are probably adequate for all except extreme overclocking applications; the Pi 3 can be used with no heat sinks most of the time. However, I am truly annoyed at not receiving copper heat sinks, since I specifically searched for, and expected, COPPER.To return, or not to return??***Added 12/18 ****RETURNED.As noted, these ‘heat sinks’ will most likely perform their intended function (and are, frankly, ‘cute’). However, I am returning this item due to a sense of indignation at being deceived, and to encourage Sellers to more accurately describe their products. To be fair, “Seller” in most cases is not equivalent to “Manufacturer/Supplier”, but must still assume responsibility for what is being offered for sale.Corrigendum: most likely, the heat sink being an extrusion, Aluminum “Series 1000” in my review should be corrected to “Series 6000”.

Fits perfect on a Pi3 and the two main sinks work on a 1B. Seems to work well.