Mühle STF extra large (25mm) extra dense ++(20%) 37% plant Fibre 
Silvertip Fibre: Designed to mimic the premium quality and performance of Silvertip Badger, Silvertip Fibre represents a world first for high-quality synthetic fibres. Incredibly soft at its fine tips, Silvertip Fibre maintains a similar backbone and firmness to that of natural hair ensuring a creamy and thick lather is still produced. Somewhat more stable in its middle section, Silvertip Fibre also has the additional benefit of being more resistant to shaving soaps and creams making the brush overall much more durable and easier to maintain!