Our Natural Select, C-A treated Douglas Fir contains no chromium or arsenic. It is ground contact rated and is virtually free of wane. Hands down the best pressure treated Douglas Fir on the market. Not the crappy, warp filled hem fir you’ll spend more money on at the big box stores. We stock 2×4-2×12, 4×4-4×6, and 6×6 in a brownish-red tone to better match our redwood and cedar products.