Solid material in terms of rubber and valve. Air holds relatively long, you have to pump before the tour anyway. The ability to change the valve insert, I find the best feature. When times bend the threaded pin by mistake, the application can be getting some air. Not because of the bend. One shortcoming I see in the low gain in the transition valve - Schlauch.Der lever is quite at 60mm. You have to absolutely go zuwerke careful when pumping here. since the seat is more stable at another provider. I reach with the two adjacent spokes as it remains relatively quiet. I still managed with 6.5 atmospheres to fit on the original spoke guard band GIANT to cut. I have the tape then "defused" with lighter and screwdriver handle shaped like a cone. So far I had not other hoses this problem. I change each season preventively.
If one pays attention to the valve seat, ok for the price