The HD OEM filters and aftermarket paper filters are rated on averages, percentages and multiple passes. ¹⁾
So a 10-micron-rated paper filter may be letting particles 100 microns and larger through.

²⁾

FLO reusable oil filter 3)

FLO reusable oil filter 4)

⁵⁾

The Outlaw is a high performance, reusable oil filter.
At the heart of the filter is a medical grade 304 stainless-steel micronic cloth filter designed to pass a large volume of oil when compared to standard paper filters. ⁶⁾
The cloth is designed to filter out particles 35 microns or larger.
(35 microns is below the limit of human visibility)

Medical grade stainless steel cloth is consistent across the entire surface.
And when rated at 35 microns (meaning nothing larger than 35 microns will pass through the material),
It is an absolute. But with paper filters, the rating is an average.
Additionally, paper filters have a bypass, so on startup & high RPM the oil is not being filtered at all.

Features and Specs: ⁷⁾

• Cleanable and reusable
• Meets or exceeds manufacturers specifications
• Medical grade 304 stainless steel filter flows 7 times more oil than a paper filter
• Reduced oil pump drag = increased power to rear wheel
• Provides faster oil pressure at startup
• Billet housing fins help drop the temperature of the oil via heat dissipation
• Integrated magnet pre-filters the oil
• Reduces / eliminates bypass of unfiltered oil found over standard paper filters
• Pressure tested to 1000 psi.
• No more cutting apart filters for inspection
• Environment friendly
• Drilled wrench nut for easy removal, includes safety wire hole required at most race tracks
• There are two quad rings included.
  A quad ring will typically last 3-5 oil changes.
  Additional quad rings are available.
  If you accidentally damage the stainless steel element, those are also available.