We has been developed this kind of products for several years.
Our WINBOB seller is willing to serve every of our customer, and thanks your support.
Remeber to use it correctly. They are tight at first but will loosen up with use.
Maybe you will feel the caps is hard to remove, but it is still work great for you bottles.
Once you place it on the bottle it fits tight and there are no leaks,so dont worry about they are no strong.