I bought these after being advised to use them to transfer alcohol ink to a smooth surface. The blue bulb had very little airflow. There is also a hole in the top of the squeeze bottle. The blue one had a lot of air leaking out of the top hole so I had to plug it up with hot glue. None of them are very "powerful" as claimed. They don't work as well as others I've seen. If I had to do it again I wouldn't order this set. He doesn't have a good boost.
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