Loops are by far my favorite Magic device for creating some of the most intense and memorable moments in Magic I have ever witnessed. The possibilities are endless with what you can do with these, and using the Haunted Deck routine with Loops has gotten me more bookings than any other magic effect I show to get a booking.
They almost make what you're doing look like actual magic, and are extremely hard to see and invisible in the right setting. Just give each Loop a good stretch, and these things will last a heck of a lot longer than most might think.
Yigal Mesika Animated Miracles, The Loops