What is the plastic grid of the click wood tiles made of?

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What is the plastic grid of the click wood tiles made of?

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Wood Plastic Patio Deck Tiles Heavy Duty Interlocking Decking Tiles Weatherproof All Weather Flooring Tile for Porch Poolside Balcony Backyard (Color : 11pcs, Size : 30 * 30 * 2.1cm) : : Tools & Home Improvement