Fuji's F-Style O-Concept Tops are their most popular, with a wide choice of sizes and compact, super strong design features. They have bottom braised ring-frame braces to add strength when a casting rod is under load, pulling the ring forward and down. Bottom braising also smooths the top portion of the frame to reduce drag and eliminate possible tangles with the frame. The finishes provide corrosion control.
Size numbers indicate ring size and tube diameter, in MM.