I use GDI with my two and we all enjoy it.
There are 7 workbooks in the series and I could only find my E, F and G books to give you details and page counts. I found the teachers manual not very helpful but it might be more useful for you.
Book E is the 5th workbook
Reviews basic italic and covers the total cursive program. Writing practice covers natural history-plants, volcanoes, cities. Explores history of the alphabet.
7 pages of basic italic review
43 pages on cursive italic
6mm, 5mm body height
Book F is the 6th workbook
Reviews basic italic and covers the total cursive program. Writing practice emphasizes figures of speech (e.g. homophones, puns, metaphors, acronyms). Explores history of the alphabet.
7 pages of basic italic review
43 pages of cursive italic
6mm, 5mm, 4mm body height
Book G is the 7th workbook
A comprehensive self-instruction program in basic and cursive italic. Writing content follows a central theme-the history of our alphabet. Suitable for older students.
13 pages of basic italic review
25 pages cursive italic
10 pages edged pen italic
5mm, 4mm body height
Written in the front of each workbook is:
Book A - basic italic - 14mm body height
Book B - basic height - 11mm, 9mm body height
Book C - Basic italic and introduction to cursive - 9mm, 6mm body height
Book D - Basic and Cursive italic - 6mm, 5mm body height
I hope this is helpful for you.