Plastic building materials, namely, plastic geocells, grids of plastic geocells, plastic geocells in the form of honeycombs, and grids of plastic geocells in the form of honeycombs, all for the purposes of drainage, stabilizing inclines, recultivation, plant support, absorption, filtration, separation, stabilization, or reinforcement of the soil, in particular for horticulture and landscaping; non-metal building materials, namely, plastic geocells, grids of plastic geocells, plastic geocells in the form of honeycombs, and grids of plastic geocells in the form of honeycombs, all for the purposes of drainage, stabilizing inclines, recultivation, plant support, absorption, filtration, separation, stabilization, or reinforcement of the soil; non-metal building materials, namely, geocells made of high-density polyethylene, grids of geocells made of high-density polyethylene, geocells made of high-density polyethylene in the form of honeycombs, and grids of geocells made of high-density polyethylene in the form of honeycombs, all for the purposes of drainage, stabilizing inclines, recultivation, plant support, absorption, filtration, separation, stabilization, or reinforcement of the soil; building materials of biodegradable raw materials, namely, geocells made of straw, coir fibers, sea grass, excelsior fibers, and combinations of these materials, grids of geocells made of straw, coir fibers, sea grass, excelsior fibers, and combinations of these materials, all for the purposes of drainage, stabilizing inclines, recultivation, plant support, absorption, filtration, separation, stabilization, or reinforcement of the soil; geocells made of straw, coir fibers, sea grass, excelsior fibers, and combinations of these materials in the form of honeycombs, and grids of geocells made of straw, coir fibers, sea grass, excelsior fibers, and combinations of these materials in the form of honeycombs, all for the purposes of drainage, stabilizing inclines, recultivation, plant support, absorption, filtration, separation, stabilization, or reinforcement of the soil; building materials, not of metal for the fixing or stabilizing of substrates, namely, geocells for the purpose of stabilization and reinforcement of the soil; geocells, namely, geocells made of plastic, straw, coir fibers, sea grass, excelsior fibers, and combinations of these materials for the purposes of increasing the load bearing capacity of soil and earth-based structures, soil stabilization, and reinforcing soil and earth-based structures