Product Description Advantage PBT proprietary filament blend for easy paint application and cleaning. Hardline no-drip interior construction and interior design that permanently marries the handle to the ferrule. This means the ferrule will never become loose. It also eliminates the area where paint, cleaners and water collect, creating a no-drip after cleaning benefit. From the Manufacturer Advantage PBT proprietary filament blend for easy paint application and cleaning. Hardline no-drip interior construction and interior design that permanently marries the handle to the ferrule. This means the ferrule will never become loose. It also eliminates tje area where paint, cleaners and water collect, creating a no-drip after cleaning benefit.