The most reasonably priced component used on the Cb600fa3 Hornet 2010 (a) England / Abs Mkh St L. Front Brake Caliper(cb 600fa/fa3) is the O-ring,2.5x1.5.
On this parts fiche the Seal Set,piston is the most specified component.
The L. Front Brake Caliper(cb 600fa/fa3) assembly is constructed from several parts from which the Caliper Sub Assy, is the most expensive.