This new RX-series in Modul is coming with choice, 7.0mm throat on shank or 7.2mm. Also two different shape on cups (slightly U-shape and V-shaped)
Two different screw rims (RX4 25.65 mm and RX3 26.00mm) in surgical steel. Shank and cup is in raw brass and rims in Surgical steel.
This combo modul set gives you 6 different set ups to find your ideal favorite.