Please note that this IS NOT the spring used in Slinky Josh's YouTube tutorials from 2016-2017 - unfortunately, I have been unable to find a reliable supplier for that size. This one is the one I have been using since February of 2018 - it is slightly larger than the one seen in my YouTube tutorials, for a bigger visual impact!
IMPORTANT UNBOXING INFO: When your HyperSpring arrives, it may be fused into a single piece. This is completely normal. Simply grab the very end of each side and pull outwards until the entire thing is unraveled.