Picking the best Invisible thread can be a bit confusing as there are so many varieties. I suppose it depends on what routines you want to use
Micro ITR
ITR Invisible Thread Reel 2.0 Magic Tricks Stage Magic Magia Magie Magicians Props Accessories Street Floating Tricks Gimmick
How to Make Invisible Thread: 10 Steps (with Pictures) - wikiHow
Invisible thread - Wikipedia
What is the Best Invisible Thread for Magicians?
Thread Genie : MJM Magic
How to Make Invisible Thread: 10 Steps (with Pictures) - wikiHow
Super-Strong INVISIBLE Thread
3 Reels X 15 Feet each, with some basic routines instructions manual. You get three spools of Invisible Thread, Each with over 15 Feet of thread,
MilesMagic Magician's Invisible Thread 45 Feet (15 ft x 3 reels) for Real Magic Tricks
Magicians Wax - 1/4 oz. : MJM Magic