Beach pebbles, normally well rounded as a result of abrasion, whose diameters are typically 0.75–7.5 cm. They are made of resistant materials such as flint, which is the dominant constituent of the shingle beaches of south-eastern England. They may also show lateral sorting, e.g. the shingle of the Chesil Beach, Dorset, England, steadily increases in size over 29 km from west to east.