The Drum hoop mixer with diagonal placement of the drum within the hoop. The rotation of the hoop itself produces a uniform, three-dimensional displacement of the material to be processed and hence a tumbling mixing action. The mixer consists of two parts: the drive support and drum hoop with acrylic mixing drum. As an option, an extended drive support for simultaneous use of two mixers of the same size is available in lengthened version (RM 5 or RM 10 liter volume, working capacity max. 40 %).