I feel the need to share this info, which has benefited both my life and that of my pet cat greatly. The best back scratcher in the world, for us humans, costs only $2 to $5 and is readily available at any store that sells housewares or kitchen equipment . It's a stainless steel spatula, which you modify by first scraping the edge on concrete -- like on the curb in front of your house, or your sidewalk, or your front porch steps. I suppose you could use a rough metal file in your workshop or some coarse-grit sandpaper wrapped around a block of wood . Then you do the second modification of bending, to appoximately 90 degrees, the last inch of the scraping edge. This steel back scratcher is stronger than anything you can buy made of wood or plastic, and it's cheap and easily replaceable. No big deal if it gets lost or if you want multiple copies of this around the house --maybe one by your bed, one by your reading chair, and one at work.