Difficult for Beginner Use for Calligraphy

I am a beginner and purchased these color brush pens that have beautiful colors, but they were very difficult to use in making lighter and darker lines in learning how to do calligraphy. It could be that I am a beginner, but some other brands were easier to use for a beginner such as me. They have beautiful colors and perhaps I can use for coloring or give them to my grandchildren.

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