Suitable for wine bottles， which aperture is about 15 - 20mm.
Material: Suction pump: Stainless steel， environmental grade ABS， silicone， vacuum stopper: Food grade ABS， silicone.
One vacuum pump and 2 stoppers included， helps preserve opened wine longer.
Size: the original length of the suction pump: 15cm / 5.91 inch， while its stretched length is 23.5cm / 9.25 inch， its diameter: 3.5cm / 1.38 inch， wine stopper: 4cm / 1.57 inch(L)， 3.8cm / 1.50 inch(D).

How to use: 
1. Wash and dry the bottle stopper mounted on the bottle， plug in and press down. 
2. Vertical alignment with the suction pump and bottle stopper.
3. Pull the pump up and down for several times， the air is released in the pumping process.
4. When you can feel the pulling suction large (usually about 10 times)， indicates the wine bottle is vacuum， and then placed in a lower temperature or stored at room temperature. 
5. Need to release the pressure in the stopper， open the toggle button at the top of the plug.