Every search engine have their ranking algorithm for ranking keywords for Search Result such as some years back google was focusing on PR as a ranking factor. In the same manner MOZ have their own known as DA(Domain Authority) & PA(Page Authority) to measure how well a website will rank on search engine result pages (SERPs).
Domain Authority is calculated by evaluating linking root domains, number of total links, MozRank, MozTrust, etc. — into a single DA score.
If any time you want to check DA of links sent you from us you can use MozBar (a free Chrome-extension), Open Site Explorer (a backlink analysis tool), the SERP Analysis section of Keyword Explorer etc.
We provide Domain Authority Backlinks which have DA70+ which are typically equal the PR9.