What is the fine-grained topic of the following text: Backed with nearly 60 years of experience, together Trinet Industries and SINSIN PHARM have brought superior pain relief products to the U.S. marketplace, including the popular line of SINSINPAS® dry-plaster pain relieving patches, which hold a major market share of OTC products in Korea. Only return the topic.
Trinet Industries and SINSIN PHARM's introduction of SINSINPAS® pain relief products to the U.S. market