1" x 11-1/2" Oak stair treads in 36" - 96" lengths. 3/4" x 11-1/2" Oak RetroTreads available in 36-96" lengths. Buy direct from the manufacturer for the best value and highest quality. https://www.stair-treads.com/stair-treads-and-risers/wood-stair-treads/oak-stair-treads.html