There is no USPS pickup on Monday February 20, 2017 because of the federal holiday Presidents' Day. USPS orders placed after 11am EST Friday February 17th will go out Tuesday February 21. UPS orders will ship as normal.
Heat shrink is the duct tape of electronics, it keeps your stuff all safe and kept together. Especially when wiring and soldering, use heat shrink to add mechanical strength to cables. We use this stuff all the time and having a zip-lock bag of all the possible sizes is super handy.
Pack contains four 6" pieces of the following sizes: 3/32", 1/8", 3/16", 1/4", 3/8", 1/2"