Ningbo Pentagon Damper Corporation is a designer and manufacturer of innovative hydraulic door hardware and hydraulic piano dampers, established in 2011. Our mission is to make every door closing experience more comfortable, elegant and safer. As early as 2003, the company predecessor Cola industry has already started to develop hydraulic dampers and it became the number one in global market share for its' field. Then Pentagon was established to expand to the door hardware industry which well applicated our technologies.15 year's accumulation in hydraulic field enable us rich experience to use best-practice in engineering, design and workmanship standards resulting in superior product performance, safety and reliability. It passed ISO9001 and CE, holds more than 50 Chinese and International patents, and been award "National High-Tech Enterprise" since 2015.Pentagon company is committed to provide solutions for glass and wooden doors with more aesthetic. We are constantly looking to add innovating products with added value through improved design or quality over what is currently in the market. And we will continue to offer remarkable quality, on-time shipping and considerate after sale service to customers.