This product is no longer available, but I found these that help your thinning hair.
Thinning Hair Boar Bristle Brush
This is a natural boar bristle hairbrush that is gentler on thinning hair than typical bristle brushes.
This brush uses a softer “cut” of bristles—not the stiffer root-end used on brushes for normal hair—allowing its 2,300 bristles to gently glide through fine hair without pulling, leaving locks looking healthy and shiny.
Imported from England, the brush is made by G.B. Kent & Sons, the world’s oldest brush maker, established in 1777, a holder of the Royal Warrant through nine consecutive reigns of the British monarchy.
Each brush is manufactured in a 10-step process that requires eight hours to complete, using only the finest natural boar bristle from India and China. Craftsmen painstakingly assemble the brush, ensuring that the bristles are secured in the yielding rubber cushion. The brush has a flat oval head. Includes a brush cleaner.
Check out the Thinning Hair Boar Bristle Brush.