MÜHLE Replacement Shaving Brush Head, Silvertip Fibre®, KOSMO/STYLO/PURIST SeriesSynthetic fibres. Suitable for the series STYLO, KOSMO and PURIST. Brush Head Silvertip Fibre This premium quality, durable synthetic fibre is synthetically produced, suitable for vegans, very easy to look after and dries faster than any natural material. The fibres are made by hand and are particularly soft at the tip. The lower part of the brush is firmer and provides sufficient backbone for a pleasant massage effect even when wet. Silvertip Fibre