The brush fits perfectly for the 0.6 liter Sodastream Cristall Flaschen.Die brush itself is made very sturdy, no cheap China Plastic Product and mind with proper care very long haltbar.Wer because germs has the brush can also easily with isopropanol alcohol 70% (available in pharmacies) besprühen.Die brush is based on the quality despite the comparatively high price ultimately favorable.