| Invisible Grills (Balcony / Window / Stair) | Cable grade (SS304 or SS316), cable thickness in mm, track material, and how many years each part is covered. | Grade and thickness decide rust resistance and strength — get them written, not just said. |
| Safety & Pigeon Nets | Net material (HDPE or nylon), mesh size, UV-stabilised grade, hook material and the coverage period. | Cheap nets turn brittle in the sun. A written specification protects you. |
| Bird Spikes | Base and spike material, the fixing method and the coverage period. | Poor adhesion or fixing is the most common failure. |
| Specialty & Industrial Systems | The load specification and written terms for your specific project. | Commercial systems need project-specific terms. |