Given the growing market of the Slims and Superslims cigarettes in the world, there is an increasing interest on improved and more accurate estimates of tow performance and filter design parameters for these filter dimensions. A study was conducted in Celanese to obtain relationships and predictive equations on capability fine Minimum Point, Maximum Point and Slope as a function of total denier and Denier Per Filament. These relationships will serve for a better yield estimation of current tow items working in different circumferences where they were not designed for. A combination of low, mid and high dpf and total denier tow items was selected to cover a wide range of items used in the market. Filter rods were produced in a standard AF2 rodmaker at 24.33, 22.76, 20.88, 18.99, and 16.79 mm circumferences. Charts and relationships found will be presented.