HEAT TRANSTER Aluminum heat exchanger can used for CPU, CO2 Laser, etc water cool system. Density of Heat Sink: 18 zigzag/inch. Flat Pipe: 12 Fan Installation Hole: 105mm x 105mm Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional.