Also known as sticker tape, this is a universal solution for installing display assemblies. 2 mm is the most popular width narrow enough for everything and easy to double up if you need it wider.
This is an approximately 50' long roll of 2 mm wide tape. Enough to repair ~100 phones, but you can also use it to repair just one! This is currently the smallest roll available, but it's really handy stuff. Even if you're only fixing one phone or tablet, you'll find plenty of applications for the remaining 49 or so feet.