18mm thickness board and inside hollow constructed workmanship & Hidden Bolt & Anti-tipping Kit,lighter than MDF,Better damp proof,More resilience,Easy to carry.The cubby storage organizer also has mortise and tenon between the two cubes to increase stability.[Free Stacking Cubes]: This narrow bookshelf,which you can freely place horizontally or vertically.You can also use multiple sets at the same time to create a customized storage space.The magic cubes can be freely combined to make your furniture layout more flexible.Eco-Friendly Material (P2):It is made of premium and high hardness(2H) and fire-retardant melamine board,our mini bookshelf has excellent strength and is ideal for long term use.It allows you to place books,potted plants,wine or other decorative items on it.Elegant Look & Suitable for Various Scenarios]: The wooden crate with its stylish appearance will bring a stylish charm to your home!Not only can it be used as a storage shelves,but can also be used separately as night stands or end tables.There is no doubt that the practical storage cube will make your messy items neatly and beautifully stored.Easy Assembly & Cleaning]: Approximately 5 minutes by one person; Amateur or not,This cube shelf organizer requires no building skills.Just follow instruction manual;Screwdriver and Hammer (not included ) are required for assembly.In addition,the smooth and dense surface of the storage cube is also waterproof.You can easily wipe it with a wet cloth to keep it clean.