Blackriver concrete obstacles are hand-crafted in Blackriver City and are the evolution of former "Bonsei" concrete.Adapted from one of the most beloved skate obstacles, the Jersey Barrier offers real street feeling and lots of trick possibilities. The Jersey Barrier and the low-to-high Barrier are a perfect combination.Size: 9.3 x 1.7 x 2.7 inch Attention: Fine hair cracks due to the slow drying process of concrete are normal and part of the realness factor of the material! The curb won´t break. Use wax to keep the surface of the concrete smooth, just like in skateboarding.