Content Writing 1

I need 16 single content pages written for 4 micro niche sites. Content pages are information product descriptions that should contain origin, uses, benefits etc. as the sites do not sell anything specifically and need to be between 350-500 words. It is understandable to have content be redundant but needs to stay unique. Attached to the project posting is an example of a content page written which displays what I am looking for as far as description and keyword density. I will give you the topics which I would like to have material written for once project is accepted.