Originally Posted by Bluphrog

I make simple 4-1/2" squares (4-patch, quarter square triangles, half square triangles), then cut a 2" strip to go around the square and sew the ends together, sew 1 square and a 4-1/2" square of batting to one side of the strip (right sides together with the batting on the wrong side of the square), then sew a 4-1/2" square with a square of batting to the other side of the strip, leaving a gap to turn the whole thing right side out. Fill with crushed walnut shells, whip stitch the gap closed. Sew a button on the top and bottom squares using a long needle and waxed thread (or dental floss) pulling tightly so that you get that "pouffy" look.
Does that work for keeping the pim sharp?
I get the crushed walnut shells at a pet store. I find it in the bird supplies. It is abrasive, so will act the same as an emery strawberry and smooth your pins and needles.