This is what happens if you use too much speed or pressure:
The one in the H.8 is a 3/32" version, the 1/8" version with the plastic melted to it is the one I usually use. I have a lot of spare sandpaper rolls, which come in the accessory kits.
Here are a couple of photos of my Foredom accessories, which come from the AK11 and AK21 kits, and showing the H.30 handpiece that I got with the general applications kit (I generally use the H.8 I bought later).