1 Big Leaf Maple (acer macrophyllum) bookmatched set of two pieces.
Size:23.6" x 7.9" tapering to 3.7" x .20"(60cm x 20cm tapering to 9.5cm x 5.2mm) each piece. 
Thickness planed top and back.
Kiln dried, currently at 10% moisture content.
Natural.