Permeable pavers feature beveled edges for crisp clean lines and large spacer bars to provide spacing for washed aggregate filled joints that allow water to drain freely between the paving units. Less than ½” gaps for ADA Compliance. Initial rate of infiltration of over 500 inches per hour. The dimensions are 4” by 8” by 2.25” thick. The paver complies with ASTM C902, Class SX, Type I, Application PX and ASTM C67 for Freeze/Thaw. All Heavy Vehicular pavers comply with ASTM C1272.