Our game-changing HD² technology makes our paving stones 1.5 times stronger than the industry standard. It’s loaded with the hardest aggregates, that means no crumbling. HD2 is jam-packed with higher particles per square inch for the smoothest smooth and the most eye-catching of textures. It’s like anti-aging for paving stones. Its lower absorption rate means years of harsh winters won’t degrade your paving stones. Rich and natural color blends that stand the test of time against UV rays, acid rain and extreme temperatures.