Description Reviews Making your own Rambone slingshot? Order the three pack to complete the Rambone and save 20%! For the do it yourselfer, you won't find a more suitable material for making quality slingshots than Baltic Birch plywood. We only carry "A" grade premium Baltic birch. Each blank is 5"x7"x3/4" and consists of 14 or 5 plys respectively. Download the PDF files to make your own Rambone. 1 Review 5 legit multiplex plywood Posted by Alfredo M. on Jul 17th 2015 this is the only place that I trust buying multiplex plywood for my slingshots.