These pen cups are great for my purposes. Using a wood burning tool, I melted a hole in each cup and attached them to the wall. The plastic is hard so I didn't drill any holes in it for fear they might break. It only took a few seconds to make the necessary adjustments for the mount. It was a lot cheaper than buying the individual mount options, which cost around $12 each. This option is basically worth a dollar when broken down into pieces. These mugs are also more square (with rounded edges) so they're perfect for this project.
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