Bamboo parquet: Surface: 2-4mm nature bamboo Middle layer: HDF E1 Harder than oak and maple With patent strength bar Environment protection selection ISO9001, ISO14001 certificate Well sell to europe market We are China Top 10 flooring factory, export 100x20FCL per month mainly to Europe and North America market, we are approved supplier of B&Q and Wal-Mart. Remark: 3 layers with strengthen bar is our patent floor. If u need more information, u can contact me directly: )ur any question will get our prompt attention