This is top zefal pump for troubleshooting. Small, aluminum body, robust impression, and major advantage in my opinion: a flexible "old" integrated into the pump which allows to screw the fitting on the Schrader or Presta valve with the reversible tip. Watertight seal. In addition, this flexible to slide outwardly, and a system prevents the latter from leaving the pump. No risk, so loss. Of course, it is always a troubleshooting solution, and it will take a little elbow grease to ensure proper inflation. (This is a single acting pump) Because of its size, it is very convenient to slip into a pocket. In addition, a Velcro fastening system is provided to hang it on a frame. Small problem: the hose is not easy to get out because the reversible tip that protrudes from the body is very smooth and difficult to handle. In case of inflation, it will find a piece of rigid wood to perform this operation. I do not know if this problem only affects the copy I received, but it can be irritating if needed. Short. Small, practical and pretty, it would be a great product if one is freed of the problem mentioned above.