Includes 30 pieces anodized aluminum+ 10 pieces copper pad shim cooling heat sink set for Raspberry Pi models A, B, B+, 2, 3b, 3b+ and 4 boards. These pure aluminum (30pcs) and copper (10pcs) 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: 10pcs aluminum large heat sink: 0.56 x 0.56 x 0.31 inch (14 x 14 x 8mm) (L*W*H); 10pcs aluminum heat sink: 0.56 x 0.39 x 0.26 inch (14 x 10 x 7mm) (L*W*H); 10pcs aluminum small heat sink: 0.35 x 0.35 x 0.19 inch (8.8 x 8.8 x 5 mm) (L*W*H); 10pcs copper pad shim heat sink: 0.59 x 0.59 x 0.02 inch (15 x 15 x 0.5mm) (L*W*H)