Kerbstone are a great way to bolster pavements. They provide the necessary support required by the pavement to support the foot traffic. It also helps reduce pavement damage from vehicles and nature. Kerb stones also support the road structure by directing rainwater towards drains.It is made up of grains, usually of quartz or feldspar. If the grains are very small then the sedimentary rock may be called a siltstone. These fine grained sediments often flake fairly easily and if used as kerbstones quite often look rather worn and battered.