One sheet of basswood board and batten look siding. Sheet is 3.5 x 24" and 1/16" thick. Grooved every 1/2" and looks like old fashioned board/batten vertical siding, depending on your dollhouse project. Unfinished. Northeastern Scale Lumber 

Also, while you are buying one piece of lumber like this, might as well get more from my store at one time!  I have to use Priority Mail Because they are 24" long - so the first piece is the pricey one. After that, the shipping price barely changes per item. PLUS I always check what my customer paid total for shipping/handling, then if I didn't need it all, I send a refund for the remainder that same day. I have clapboard, flooring  and strips. . check it all out before you check out!