Heavier top covers are needed for high impact i e under a primary crusher long drop at feed area or very abrasive material High Silica Heavy covers Conveyor Types Masaba offers several different types of conveyors A few examples and brief descriptions are given below 36 X 80 39 Portable Self Contained Stacker Heavier top covers are needed for high impact i e under a primary crusher long drop at feed area or very abrasive material High Silica Heavy covers Conveyor Types Masaba offers several different types of conveyors A few examples and brief descriptions are given below 36 X 80 39 Portable Self Contained Stacker