This is an excellent black plastic fan shroud for the "Black HeaterCore" we sell. Mounts a 120mm fan perfectly, without requiring the mounting screws to pass through the radiator itself. Offers optimal distance between fan and the radiator fins - unlike many others on the market that sacrifice performance for cost. Dimensions: 6.5"x 6 3/8" x 1 5/8" Excellent performance at a low price!