* Very high stock removal rate
*Fiberglass backing plate - Most popular and it's can reduce vibration and is consumed together with the flaps. High strenghth with light weight.
*Plastic backing plate- With very nice lookings and is trimmable to increasing service life. The ABS plastic backing with very high strength and supply mas safe working performance. Spin-On style also availabel.
*Nylon - Very familiar with plastic backings but with more light weight.
*Metal HUBS: provides extra high strength and rigid support as needed and normally using for heavy task . Also it can be recycled.