After I've looked at a manual on the internet, I understood quite quickly the principle. The instructions on the back is indeed rather dürftig.Die Kam Snaps have great colors and now I can beautify my sewn works Ruck Zuck and largely without annoying zippers. Since I mainly Kindersachen near, I am very satisfied with this solution. Replace the way also is very simple. The button placed on cross stuck into the pliers, press fixed and it shuffles off again without leaving any damage. Excellent!