Traditional Mongoose PT shaker screen is made of steel frame, composite screens have the following advantages compared with steel frame screens: 
Higher throughput, Longer life, Fewer replacements, Lower cost.
The composite screen’s weight is much lighter than steel frame screen, and same with the original HIFLO screen. But the price is also triple more than the steel frame screens. For some of the clients who care the screen replacement time and service life, composite screen will be the ideal choice.