The Babolat Roddick Junior 140 is fitted for children eight to nine, and the 145 for children nine and older. Both the 140 and 145 have a larger head size 105. sq. inches, and weigh successively more as children are able to carry more heft. Head Size 105 sq. in. 677.4 sq. cm. Strung Weight 8oz 226.8g Composition GraphiteAluminum