heat shrink ?

[t-maxxracer32]

what kind of heat shrink do i gt to put over my batts?

i broke my 7 cell batt and my g/f dad took it to the base and had some people solder it back together and they also used this awsome heat shrink. ive never seen any this big but it held the pack together perfect!! so where should i get heat shrink like this? or what size is it called?

thanks!