The wheels were well constructed and didn't fall apart. Beware that they are only a couple inches in diameter, which means one inch from the center out. I was sanding an inset on a door, so I found that the body of the drill hit the door frame. I wish I had bought ones with a greater diameter. Some flap sanding wheel commentators have noted these are quite rigid, and I agree. For wood it might be nice to have fewer flaps for more give or flexibility. I noticed a little gouging.