ABS material: The flood control board is made of ABS material with anti-UV coating on the surface. Easy to store: stack together for easy moving L-type water retaining principle: the weight of the water is pressed on the bottom of the water retaining board, converting the weight into pressure. Even if the flood rushes to the top of the water retaining board, the water retaining board will still be very stable and will not overturn. The higher the water level, the more reliable the water retaining effect. Locking structure: snap-on connection design, tighter and more seamless Wide range of uses: can be used in motor housings, highway waterproof guardrails, subways, shopping malls, garages and warehouse entrances, etc.