+ The product's description
+ Wire of stainless steel
+ Top notch incorporated brush; until now no hair loss ;-)
+ Highly flexible, "directional stability"
+ High detergency
+ No damage to the hoses
+ Price / performance very good
highly recommended
(In use for over 3 years)
Note:
Tube brushes with 1.5mm diameter are according to my experience for Petra hoses and most pad / coffee machines too thin.