Made from 16mm Birch Form ply giving them a very sturdy structure This is a fantastic formwork option that allows you to adjust the size of the cavity to suit the project and the timber slab. Don't be stuck to a fixed size The form ply combined with Ease Release 200 allows the form ply to easily release off the resin. This kit comes with a 600 x 600mm base piece and four 600mm long x 60mm high edge pieces. Depending on the resin that is being used and the project. Formwork can be put together using tape (suitable for multi layer pours with faster curing resins) nailed using a small finishing gun or screwed together. Once used form ply can be reused over and over, if there are nail or screw holes, a small piece of clear tape can be stuck over them In our timber and resin class we use the same pieces all year