Each piece is unfinished cedar meaning. Cedar is a durable wood that is resistant to shrinking, swelling and decay. Handwash periodically with mild soap and a soft cloth. Rinse with a hose. Wipe dry. Short Beam measures 36" L x 5" H x 3.5" , stabilizing base 8" wide. Medium Beam dimensions: 36" L x 8" H x 3.5" W, stabilizing base 12" wide. Tall Beam dimensions: 36" L x 10" H x 3.5" W, stabilizing base 16" wide.