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About product and suppliers:
        Alibaba.com offers 182 composite window sill products. About 8% of these are door & window sills, 4% are artificial stone, and 2% are marble. 

A wide variety of composite window sill options are available to you, such as natural stone, pvc, and aluminum. You can also choose from free samples. 

There are 116 composite window sill suppliers, mainly located in Asia. The top supplying country or region is China, which supply 100% of composite window sill respectively. 

Composite window sill products are most popular in Southeast Asia, North America, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 40 with ISO9001, 25 with ISO14001, and 18 with Other certification.