Includes 3 pieces anodized aluminum+ 1 piece copper cooling pad shim heat sink set for Raspberry Pi models A, B, B+, 2, 3b 3b+ and 4 boards. These pure aluminum and copper heatsink include heat conductive 3M 8810 adhesive tape for optimum heat transfer. These heat sinks have profiles which are short enough to fit within standard Raspberry Pi cases. These heat sinks kit can be applied in other devices to cool processor, regulators, VRAM VGA RAM, IC Chips, Mosfet SCR, Southbridge, Northbridge etc. Material: Aluminum. Package includes: 1 piece aluminum large heat sink: 0.56 x 0.56 x 0.31 inch (14 x 14 x 8mm) (L*W*H); 1 piece aluminum large heat sink: 0.56 x 0.39 x 0.27 inch (14 x 10 x 7mm) (L*W*H); 1 piece aluminum small heat sink: 0.35 x 0.35 x 0.19 inch (8.8 x 8.8 x 5 mm) (L*W*H); 1 piece copper pad shim heat sink: 0.59 x 0.59 x 0.02 inch (15 x 15 x 0.5mm) (L*W*H)