well I would go for a focus, length or girth i.e. if your focus is girth then get a tube .5 inch longer than your BPEL and 1 - 2 inches more girth, if you want length vice versa. Also get a heating pad and heat up you tube before sessions and during. I am having great results with 3 [words=https://officialhydromaxpump.com/?uid=6&oid=2&affid=98]x 20[/words] mins sets with edging between, every other day