This is a 5 Manual Lot on the HT 102, 103 Workshop Service Manual and Parts List Manual, Telescopic Drive Tube Workshop Service Manual, HT Gear box Workshop Service Manual and the Power head Workshop Manual. The 4180 service manual has 64 pages in it and the Parts Manual has 27 pages. The Telescopic Drive Tube Workshop Service Manual has 11 pages. The HT Gearbox Workshop Service Manual has 15 pages. The Power head Workshop Manual has 48 pages. You will see that the 4180 is the Service Manual with this. This is the service manual that STIHL says is for this saw. These manuals Help you do you own work on your saw. This is actually made out of paper/book/magazine. The Manuals you receive will be as the ones pictured.