It's a loop to create a paper to train handwriting.
The lines are smaller than Lineatur 02 which is standard for german school 2nd year.
In this package there are German Suetterlin und Peter Wiegels Bienchen (Schulausgangsschrift) included.
This template allows you a quick start creating books with LaTeX that you can directly publish on Amazon, Google, and Leanpub as e-book or printed edition. Check out the accompanying book "Better Books with LaTeX the Agile Way" for step-by-step instructions for this template: https://amzn.to/2Jiwpzh
(02/08/2020: fixed issues relating to TeXLive2019 upgrade. pdfLaTeX PDF output is no longer working properly but the HTML output is fine, so is the XeLaTeX PDF output).