1. Damper: closed structure greatly protects damper tube, abrasion-resistant and durable, more silence, long using life, novel appearance, simple and reasonable structure, wide application.

2. Auto-hanging hook function: No need to worry about the unhook issue after installation.

3. Anti-jumping function: Adjust the anti-jumping device for preventing door jumps when closing and to avoid roller damage, which ensures smooth door sliding and long use life.