Depending on the colour selected, they are available in sizes, XS (6.3 in or 16 cm), S (6.9 in or 17.5 cm), M (7.5 in or 19 cm), L (8.1 in or 20.5 cm) and XL (8.7 in or 22 cm). (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.