My favorite https://www.amazon.com/gp/product/B00SOKFHFG/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Sorry for asking so many questions but how is this ball? https://www.amazon.com/dp/B00SOKFHFG/ref=twister_B00W77M3PE?_encoding=UTF8&psc=1