AS a quality seals manufacturer, Bosslong has a group of professional R&D, high-quality products and efficient after-sales service.

With more than 80 billion sets applied over 20 years, Yuanji seals solutions support hundreds of doors and windows suppliers globally. Yuanji seals range includes foam, extruded and draught seals. Whatever the application there is a product in the Yuanji range to suit.