Shaving brushes made from synthetic hair is popular among men. It's free from animal fur, great value for the money.  Imitation badger synthetic shaving brush knots have soft silver-colored tips and a strong black brush stem. It retains water fairly well and lathers nicely. When comparing badger or boar brushes to synthetic ones you would find the synthetic shaving brush head to be far softer. The product pictures are individual taken, and they are showing exactly the brush head for shaving brush, which is actually for sale.

Usually synthetic hair shaving brush knots are made as following sizes:

19/60 mm, 20/63 mm, 21/64 mm, 22/65 mm,23/66 mm, 24/67 mm, 25/68 mm, 26/68 mm, 27/70mm, 28/73 m, 29/76, 30/80 mm,  or as per your requirements.