1.CE & BV certificate 2.waterproof 100% 3.Adjustable size 4.Eco-friendly WPC Characteristics Comparison with wood: CharacteristicWPCWoodMoisture ResistanceWaterproofWater absorptiveRot ResistanceAntisepsisRot except special treatingSplit ResistanceNo CrackedCracked by weathering effectDistortion ResistanceAlmost no Contraction /expansionDistorting effected by change of moisture and temperatureUV ...