Material: Aluminum Alloy EPDM Seal. The surface of each plank is coated anodized. . Each plank has a height of 16cm and 3.5cm thick. . Weight 2.785 per meter. .With 6 bones to help withstand water pressure. .With EPDM rubber strips at the bottom of each plank. .With plastic cover on both sides. . Have passed the tests from MIRDC (Metal Industries Research & Development Center): Each 1600cm2 can withstand loads up to 1300kg.