Features: 100% brand new and high quality very good performance on heatsink transferring to Heatsink or radiator for heat dissipation. Aluminum alloy, anodic oxidation surface treatment for better heat dissipation. Cool your electronics to a safe temp to avoid overheating and throttling, improve your computer's performance. High precision, high quality and long life Applicable to: graphics card backplane, Raspberry Pi 1 2 3 generation; security ; ultrasonic; router ;CPU; IC heat sink; PCB power board ;solid state drive etc Package Includes: 4Pcs x Pure Aluminum Heat Sink with Thermal Pad Specifications: Item: Heat Sink Thickness: 0.2mm Material: Pure Aluminum Heat conductivity coefficient: 1.5W/(m.k) Adhesive: Acrylic Quantity: 4pcs Color:Golden/Green/Red/Silver (Optional) Liner: PE Film Temperature Reresistance: 120-180 Size:Approx 40x40x11mm/1.57x1.57x0.43in note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment