WindsorONE Protected S4SSE Trim Boards are made of real wood, finger jointed and coated with three coats of acrylic latex primer. Manufactured using clear radiata pine, WindsorOne Protected primed finger jointed boards are for interior and exterior use. Straight and true boards are treateded to the core and primed with a safe, ecologically sound water-bourne process. Because it is protected to the core, WindsorOne Protected boards treatment is not diminished by cutting, shaping, moulding or shaping. With no finger joints on the face of the board, WindsorOne Protected trim boards paint up to a beautifully smooth finish.