Non-woven Flap Wheels are made of multiple elements of non-woven abrasive material, arranged radially. Dense packing of the layers ensures long service life. Interleaved Flap Wheels are also available where the non-woven abrasive is arranged radially with abrasive cloth interlayer’s. Interleaved options permit an improved stock removal and produce a coarser finish. Due to the flexibility of the non-woven fleece these tools will not alter the surface geometry of the work piece in any way. Flap wheels differ in different overall dimensions and grit sizes. Both ring and spindle mounted versions are available. These tools are used chiefly for surface conditioning.