Primary Aluminum Water Cooling Block 40 80 120 160mm for Liquid Water Cooler Heat Sink System Silver Use For PC Laptop CPUFeatures: Internal channel of extrusion flow forming Brazing parts in one piece Processing: vacuum brazing aluminum Surface treatment: silver oxidation Suitable for computer CPU water cooling, industrial driver inverter, laser head cooling, and industrial cooling control cabinet Specifications: Item Type: Water Cooling Block Material: Aluminum Alloy Color: Blue Size: 1#/2#/3#/4#/5# (Optional) 1#: 40x40x12mm / 1.57x1.57x0.47in 2#: 40x40x12mm / 1.57x1.57x0.47in (Upper water outlet) 3#: 40x80x12mm / 1.57x3.15x0.47in 4#: 40x120x12mm / 1.57x4.72x0.47in 5#: 40x160x12mm / 1.57x6.30x0.47in (approx.) Quantity: 1 Piece (other accessories shown in picture are not included) Notes: 1. Conversion: 1cm = 10mm = 0.39inch 2. Please allow 0-1cm error due to manual measurement. Ensure you are comfortable with this before purchasing. 3. Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you! Package Includes: 1 x Water Cooling CPU Block (No retail packaging)