The melamine table top is moisture resistant, dirt resistant and easy to keep clean. The dining table can be extended with 1 extra wing to seat 2 - 4 people; allows the table size to be adjusted as needed. . Extra portions can be stored for easy retrieval from under the table. Can be easily extended by one person. The clever design means the table top surface has no grooves when you use the table without extending it. These chairs have been tested for public use and meet safety, durability and stability requirements, as specified in the following standards: EN 16139-Level 1 and ANSI/BIFMA x5.1. . Product Materials : The table can be extended Feet/ Edge rails : Steel, Epoxy/polyester powder coating Inside legs : Steel Table top : Particleboard, Melamine coating, ABS plastic Chairs : Reinforced polypropylene plastic . Product Care : To increase stability, re-tighten the screws after about two weeks after installation and when necessary.