1. Model number:ssg-540 2. Material:stainless steel 3. Stretch length:512mm±5mm(20) 4. Collapse length:220mm±5mm(8.6) 5. Color:black 6. Working life:anti beat times1000times 7. Trademark:haaq 8. Net weight:550g(steel material) 9. Expand and collapse:more than 3000 times 10. Packingsize:220x45x45mm(inner), 490x235x250mm(50pcs/carton) 11. Net weight:33kgs 12. Gross weight:35kgs