Raspberry Pi Heatsink,Yoolight 20pcs Raspberry Pi Aluminum With 3M 8810 Thermal Conductive Adhesive Tape for Raspberry Pi 3 B, Pi 2 B, Pi 1 B+

Great assortment, fast ship

This product is advertised as having "thermal tape applied" ... 3M 9448 is TISSUE TAPE which is an insulator. Most of these Pi heatsinks floating around use this junk and it is not thermal tape, but rather a significantly cheaper alternative that does not conduct heat.