1. Corresponds to tiny dust (10~100 μm) in general environment 2. Four times more durable in micro dust environment (compared to standard products) 3. Full length dimensions and installation are interchangeable with standard products (except for some models) 4. Enhance durability by forming a lubricating oil film on the surface of the piston rod 5. Prevent dust and foreign matter from entering 6. The lifespan will also be higher under normal circumstances.