Created with Glass Fibre Reinforced Plastic (GFRP) - this gravel board, is lighter than concrete and timber alternatives, without compromising strength. GFRP is a high quality composite constructed with two main raw materials: unsaturated polyester resin and glass fibre. Using GFRP has many benefits: light-weight, high mechanical strength and impact resistance, high resistance to chemicals, stains and corrosion. The ‘Z’ profile shape means that the boards can be neatly stacked together saving storage space in your van or yard.