The "checkered" wood marquetry strip as used on the back center seam of style-28 Martin guitars after World War II.
This distinctive backstrip is laminated with black fiber and natural unstained "white" wood.
.175"wide x 1/8" thick x 23" long (4.44mm x 3.18mm x 584mm)
TIP: Dimensions are approximate. For proper fit, the wood backstrip should be measured directly before joining the back halves on your instrument.
Also available: Zipper Backstrip, the classic pre-war Martin style-28 pattern.