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No, that is not a typo.  Both of my YZ450 fork seals were leaking a couple of rides back and I actually fixed the problem without the costly process (time and/or money) of replacing them.  These fork seals were replaced ust after I bought the bike so that I would have a fresh start and a ‘known’.

How?  Check it out:

Its similar material to mylar and it purpose is to clean the inner surface of the fork seal from debris, etc.  35mm film has been rumored to work as well. 

I could go through the whole process of documenting the how-to process, but its laredy very nicely done at the SEAL MATE website.  The Cliff’s Notes version is simple

1. pull down the dust seal with a small screw driver
2. insert the hooked end in between the oil seal and the inner fork tube
3. rotate the Seal Mate all the way around
4. go buy a 6-pack of that special occasion only beer since you probably just save about $150 unless you do it yourself

Seriously, don’t ever change the fork seals on a street bike or dirt bike without trying this first.  The tool is sold pretty much everywhere, and at $5 it should be in everyone’s toolbox.  The only problem is that they can wrinkle and have a finite life so the Seal Mate will likely have to be replaced over time.  Did I mention that they were only $5?

No ‘GOOD / BAD / UGLY’ for this is necesary.  Its 5$ and and saved me several times.