The FWE 3.5" Poly Plastic Flexible Concrete Form FF3550 Flexiform board is manufactured with 100% recycled HDPE plastics. This is the kind of plastic found in milk bottles. In fact, one roll of Flexiform is made from 129 plastic milk jugs. Unlike other types of plastic, HDPE is the most environmentally stable giving off no harmful fumes into the environment. The Healthy Building Network recommends HDPE resin-based products as the most environmentally friendly plastic building materials. FWE Flexiforms are designed to hold up for many reuses (20 plus times) as a form board, and when they are finally ready to be replaced, the materials can be recycled again into new useful products. Flexible concrete form board is used to form and pour concrete pool decks, sidewalks, patios, driveways and any concrete surface with curves and tight radiuses. Tile setting boards for installing tile or coping on swimming pools. A great landscaping border for Landscapers and Flexiform is great for any project that needs a forming board.