Coolstick Soundproof Doors: Beijing Coolstick Doors and Windows Co., Ltd. was established in 2016. It is a company specializing in the production and sales of soundproof doors and windows, airtight doors and windows, electric sliding AB access control system doors, explosion-proof and fire-resistant special-shaped doors, detention cell doors, and other metal special doors and windows. The company has obtained three system certifications, including "GB/T 19001-2016/ISO 9001:2015," "GB/T 24001-2016/ISO 14001:2015," and "GB/T 45001-2020/ISO 45001:2018," as well as fire protection product certification certificates and other honors.