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The combination of wood-plastic composite railings or pergolas with steel significantly improves the safety performance of the overall structure. Although wood-plastic materials have certain elasticity and beauty, they are relatively weak in load-bearing and wind pressure resistance. The addition of steel just makes up for this deficiency. Steel has excellent strength and toughness, and can withstand greater external impact and wind loads, ensuring that the railings or pergolas remain stable and reliable under severe weather conditions. This combination not only improves the safety of the product, but also brings more sense of security to users, making it widely used in special environments such as high-rise buildings and lakeside areas.