Walnut$12. 85 SF + Free Shipping Warm walnut for that cozy + modern feel. Our Timeline Walnut Panels are the DIY answer for the mid century lover. Real walnut boards with a soft sheen and made extra thin so they fit behind window trim, moulding and baseboards. Comes with an easy to install tongue + groove, so you can hide the nails. Proudly made in our sunny factory in Portland. Package Dimensions: 10. 50 SF per Package (6 panels) Panel Dimensions: 3 8"