They are available in sizes, XS (16cm or 6.2"), S (17.5cm or 6.8”), M (19cm or 7.5”), L (20.5cm or 8.1”) and XL (22cm or 8.7" - Black only). (See size selector for current size availability). As a general guide, ladies and young teenagers are generally small, and an average size male is a medium. All orders are shipped within 24/48 hours (weekdays only) by Royal Mail. Postage is free and there is an option to upgrade to next working day delivery so please ensure you select an address where someone is available to sign.