Masters of the Universe (commonly abbreviated MOTU and sometimes referred to as He-Man, after the lead hero) is a media franchise created by Mattel. The main premise revolves around the conflict between the heroic He-Man, real name Prince Adam, and the evil Skeletor on the planet Eternia, with a vast line-up of supporting charactersin a hybrid setting of medieval sword and sorcery and sci-fi technology. Later spin-offs also featured He-Man’s sister She-Ra and her struggle against the Evil Horde, along with other planets/settings; however the main premise usually remained the same. Since its initial launch, the franchise has spawned a variety of products, including six lines of action figures, four animated television series, several comic series, and a feature film. — Wikipedia
These are from a set of ‘adult collector’ action figures, with new figures being released every year, from 2009.