World Rugby's new size 4.5 balls - about 3% smaller but the same weight as a regulation size five - will be used for the WXV Global Series and are now in use in the England camp. In May, England fly-half Zoe Harrison said it is "the worst decision someone has ever made". "I think it's too early for for me to say that it's going to help our offloading game or it's going to help out with the pass. World Rugby held a trial for the smaller balls with female players on the top-tier Sevens circuit in November. Mitchell said the trial "certainly might help other teams" but he added conclusions would likely be drawn after the first three Tests at home.