Great for ACEOs, these unfinished wood blanks are 2.5" x 3.5" and cut from 1/8" thick baltic birch plywood.  They are sanded and ready to paint.  When the rectangles are held vertically, the grain is going across from side to side.  If you mean to paint horizontal or landscape paintings, let me know in an email, and I will cut them so the grain is going across.