I used some scrap 1/4" hardboard cut 18" by 12" rounding the bottom corners with a jigsaw. Then cut a piece of 1x2 18" long for the top backing. This simulates the "clapping arm". This slate does not "clap" since that is a vestige of the old devices that made a noise used in syncing sound. We just want a way to identify our shots for editing. 1" wide sticky-backed velcro, a good adhesive, 1" adhesive-back lettering, a couple wood screws, a roll of 3/4" masking tape, and finally black and white paint rounds out our materials list.