STUBAI - The #5505 series are STRAIGHT gouges with a #11 flute or sweep.
Note: The code explained. For a tool designated for example as as a #551114, the 55 is the SERIES, 11 is the SWEEP (curvature) and 16 is the nominal WIDTH in mm at the tip.
Click HERE to go to a Data Sheet on Stubai carving tools. This data sheet will explain the nomenclature used for carving tools of which there are hundreds of variants.
Click HERE to see a .pdf of the makers Series 55 catalogue.