These tools are full machined and/or laser cut, which helps them retain a sharp edge. The tools are used by many defense contractors and Naval air stations for sealant application, sealant removal, paint removal, acrylic canopy contact, and general use. They are made from cell cast acrylic or black nylon as noteed. These tools can be resharpened on an abrasive belt or disc.
I ordered part #12-02360. They are very brittle and after only one use they started to crumble apart.