One of the most economic models with simple design and pratical function.This product is a classic product in the market. Its technology is mature and its performance is stable.High quality PP (polypropylene) multi-element composite material is used for rubber base, back and armrest. It is the first new material without any toxic substances and heavy metals. It is safe, healthy and environmentally friendly. Chairs can be installed on horizontal flooring or on steps,in straight orcurved rows.