Wood Species: We only use the finest wood material for our cabinets, like :Birch, Maple, Cherry , Oak, Alder. These wood materials are imported and after high quality kiln dry, the moisture component is limited to the right percentage, at the sametime wood movement is limited to the least. Cabinet Box Material : Plywood at thinkness of 12mm, 15mm or 18mm; MDF (medium density fiberboard) at thinkness of 12mm, 15mm or 18mm. Particleboard at thinkness of 12mm, 15mm or 18mm. We also use the " Green" , 0 formaldehyde Wheatboard or E0 grade plywood cabinets which formaldehyde emissions meet the New California Formaldehyde Standards 2009.