Different size to meet you requests Nylon chair base with best quanlity and price This product passed SGS test used ... 5pc/cartonSize :270mm,280mm,320mm,330mm,340mm,350mmOffice chair base:1.Chair base made by PA66+GF, firm and durable material2.Office ... produce experience in producing 50000 products within a month with high standard quality chair base,high quality, popular design, reasonable price