eMG is the new generation of elastomer bellows seals.

Optimized bellows designDirect bellow support
optimized automatic alignment
Minimized stick-slip effects 
Innovatibe PEEK-PTFE diskOutstanding sliding properties
Consistent centering
Continuos self-cleaning of disk and shaft 
Optimized high-performance SiC seriesUp to 50% longer operating periods
Extended emergency running properties
Reduced power consuption

See the datasheed for eMG1 here eMG1