The left side is the knife I bought from Preferred Edge. I've only used it on apple wood, to try it out. Its double edges and I like the idea. However like most things it takes me a while to get used to it. I want to use it on a cherry wood bowl I've started but lacked the means of finishing.
The black thing on the right is a scalpel handle made by Veratis. A compfortable tool in the hand. I'm using it in an effort to clean up carvings. The butt end has a cavity for spare blades.