HO Stair Stringers & Treads - laser-cut from sheet 1/32" basswood - around 2.5" thick in HO scale. Just the right thickness but not too thick.
Sheet contains (8) HO scale Stair Stringers each a scale 38 feet long on a carrier sheet along lengths of Tread pieces. These stringers can be cut to desired length. They will stain nicely with a wood stain or paint well with acrylic paints.
As for Treads, there is a pre-cut section of 36" length treads (the most popular width for a staircase), and remaining treads may be cut-to-length for desired staircase width.
Review item number RSM-T3001a for a helpful stair stringer assembly jig.