... hollow, one piece parts such as large oil or chemical tanks, kayaks, point of purchase displays, frames, cases, furniture, carts, ... products .The advantage of rotational moulding:1)The cost of plastic rotational mould is low.2)The edge of rotational moulding products can reach more ... developed have Music Box, Oil Box, Toys for Children, Water Tank, Clothes Cart, Cone Barrel, Dividing road cone and ...