The original Pinmoors are self healing. I haven't noticed any dullness by using them. I have had them since they first came out, years ago. I detest pin pricks and use them on every straight pin except the pins I use for my design wall.

I was given a couple of Pinmoors at a shop hop or some such. I use them on the tops of needles that are in my pin cushion. No getting stuck and no needles working their way into the cushion!