little sheets of wood

My wooden (birch) postcards arrived in the mail yesterday and are all ready for a bit of gocco embellishment as my future moving announcements.

Right now… Mr. M and I have been debating the need for an envelope when we send them. They seem quite sturdy, are thick enough to mail, but he had a vision of splinters and broken pieces with the mailing machines. If that’s the case though… the design would need to be modified significantly, since it’d only need to be on one side.

So… do you think I should ensure their safety and buy them an envelope? Or test run a couple through the mail?