All beds are constructed using solid Birchwood. They do not contain any MDF or particleboard. All paints and stains are tested and are 100% free of any lead substance. All beds offer the option of a sliding trundle for extra storage or an additional mattress. The Mission and Cambridge bed allow for adjustable height side rails to allow for a stationary 4 drawer storage unit. All side rails are one inch thick for extra strength and durability.