WISA plywood long grained Finnish WISA board. PEFC Certificated WISA Spruce ply in 9mm, 12mm, 18mm, 24mm thicknesses from Creffields. Log on https://www.creffields.co.uk/products/plywood/wisa-plywood/ https://www.creffields.co.uk/products/plywood/wisa-plywood/