Pennwood Unfinished White Oak Solid Hardwood 11/32 in. Thick x 7.5 in. Wide x 36 in. Length Retrofit Riser, $29.99 USD/Box, LL Flooring (Lumber Liquidators)

Designed for placement on a stair riser's step face, this riser complements the lower stair tread or hardwood floor. Made from unfinished white oak, it offers a solid hardwood option at a price of $29.99 USD per box.