This is a guest post on a niche relevant blog that has a good Trustflow score which includes a link back to your web site.
So these are strong links that work very well for improving rankings as the strong Trustflow score and niche relevancy are key factors in what make for a strong back link.
I write a very high quality guest post so your link will be in a blog post of a high quality and I also include one other relevant but non-competing link so that the blog post looks completely natural. The post is not labelled as a guest post so search engines will not know this, it will just appear as a natural blog post on the web site.
I can provide sets of these so five or ten are good options to get a strong boost in rankings, this of course all depends on the level of competition so you may need less than that to get a good boost.