This is the stuff I like from Harbor:
http://www.harborfreight.com/8mm-x-5...ing-98066.html
They offer a boxed set that is not on the website of the three sizes they do show on the website. It is great stuff. Note the 2 to 1 shrink rate. Find I have uses for all three size working with battery leads and connectors. Have not used the little package of the different ones they list.