Where is Dusband a brand from?

Chinese brand.

Dusbond is a Chinese brand, mainly producing hyaluronic acid condoms, which still sells well in mainland China.

Dusbon is a medical device brand, mainly engaged in surgical, medical and veterinary instruments, apparatus, equipment, excluding electronic, nuclear, electrotherapeutic, medical X-ray equipment, apparatus and instruments, medical aids, equipment and supplies, orthopedic supplies, pacifiers, bottles.