1.The individual parts of the floor mats simply slot together to form a surface ideal for pedestrian areas when filled with grass or gravel and for areas of vehicle traffic when filled with grass. 2.Geocells Grid: Permeable graver is made of an extremely thick highdensity polyethylene (HDPE), light weight and gives it excellent resistance and stability against all common elements in soils as well as protection against ultraviolet degradation. 3.HIGH STRENGTH: the landscape geogrid is 1885 lbs per square inch coverage of each unit when cells are filled. For areas where you experience poor or unstable floor! 4.Easy to use: flexible in expansion and contraction and can be folded during transport. When building, you just need to spread out the grid, anchor it to the ground with enough reinforcement rods/anchors and fill the cells with either soil, grass, sand or gravel! 5.Single cell grid area: flexible in expansion and contraction and can be folded during transport. Fully extended single cell grid area: 15.7 x 15.7 inches / 40 x 40 cm / 15.7 x 15.7 inches, optional height 5 cm (2 inches), 10 cm (4 inches).