This is ALUMINUM CPU RADIATOR 40mmX200mm Water Cooling Block  LIQUID WATER COOLER HEAT SINK FOR Thermoelectric Coolers and other electronics projects. 1. Item: Water Cooling Block 2. Size: #1 40*200mm 3. Material: Aluminum Alloy 4. Color: Silver 5. Heat dissipation method: the liquid conducts the cold and heat exchange. Features: 1. Brazing parts into a whole 2. Internal flow channel extrusion forming 3. Can be connected with internal diameter 7-8mm/0.27-0.31'' water pipe 4. Solid construction, aluminum material is a good choice for heat dissipation 5. Applicable to computer CPU water, industrial inverter driver, laser head cooling, industrial control cabinet cooling. Package Included: 1 x 40mmX200mm Water Cooling Block