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Concrete or cement interlocking pavers are most frequently used to mimic cobblestone paths. The ability to lay pavers without mortar is what makes this product so special. The interlocking aspect is precisely what makes these pavers durable and fresh-looking even after years of misuse and weather. When these pavers are set, spaces between each brick are left, and when these gaps are filled with sand, the entire structure is strengthened. By acting as a binding agent that is strong enough to hold everything in place yet flexible enough to accept high loads, the sand aids in keeping the pavers together by allowing just the right amount of movement to prevent cracking.