1. Damper: closed structure greatly protect damper tube, abrasion resistant and durable, more silence, long using life, novel appearance, simple and reasonable structure, wide application.
2. Roller: Mute bearings with multi-layer nylon, thickened rust-resistant frame, more stable and durable, making the door closing smooth and unimpeded.
3. Anti-jumping function: effectively prevent the door leaf from moving up and down.