30mm Bushmaster Synthetic BrushProduction has finalized for the Caisson Shaving Company Synthetic Shaving Brush. The handle is hand made in the USA and is made from a real 25mm Bushmaster casing. After cutting the casing to size it is then powder coated, sealed and finally fitted with a 30mm synthetic knot. This brush is built to withstand the tests of time! Strength. Our synthetic fiber brushes are far stronger than the natural fiber. Drying. Synthetic fiber will dry much more