Includes 40 pieces silver tone aluminum+ 10 pieces copper pad shim cooling heat sink set for Raspberry Pi models A, B, B+, 2, 3B, 3 B+ and Raspberry Pi 4 boards. These pure aluminum (40 pcs) and copper (10 pcs) heatsink include heat conductive 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, VRM VRAM VGA RAM GPU, IC Chips, MOSFET SCR, Southbridge, Northbridge etc. Package includes: 10 pcs aluminum large heat sink: 0.56 x 0.56 x 0.31 inch (14mm x 14mm x 8mm) (L*W*H); 10 pcs aluminum heat sink: 0.59 x 0.35 x 0.19 inch (15mm x 9mm x 5mm) (L*W*H); 20 pcs aluminum small heat sink: 0.35 x 0.35 x 0.19 inch (8.8mm x 8.8mm x 5mm) (L*W*H); 10 pcs copper pad shim: 0.59 x 0.59 x 0.02 inch (15mm x 15mm x 0.5mm) (L*W*H)