The special circular is blow-molding plastic seat, differing from the wooden or inject-molding plastic seat product, have easy and convenient, environmental protection, beauty and full of flexibility. The product has waterproof, anti-oil, anti-ultraviolet radiation and so on. the patent of seat and a snail design, rising to sit the feeling comfort, making the product sit the feeling in summer ice-cold, rise the constant temperature function again in winter. Combine the seat and the foot perfect and strengthen firm of the product. The color of silver and black in feet of iron even make the product seem to be diverse beauty.