The core activity of Sisters Hair Fashion GmbH is the provision of services in the field of hair care and styling, including: haircuts and styling for ladies, gentlemen and children, hair coloring and treatments (e.g. highlights, balayage), hair care and treatments (e.g. exfoliation, hair cleansing), makeup and beauty services (e.g. evening makeup, wedding makeup), and consultation and sale of hair care and styling products. The company offers these services in its salon in Biel and emphasizes personal consultation and professional service.