Yes, that is correct. The deck tiles do have tiny spaces between the slats, where small particles can fall into. However, they are easy to clean with soap and water, including light hosing.
Our stair trim (see https://www.newtechwood.com/deck-tile-naturale/#accessories) would fit any use of our deck tiles on stairs.
As of November 2019, our stone deck tiles are still anticipated to be available early next year 2020. They come in two patterns, one with smaller pieces in the design (US-QD-STR1-ZX) and one with larger pieces (US-QD-STR2-ZX). They weight 5-6 lbs. per deck tile and would be sold in 5-piece boxes (30-31 lbs. per box). […]