This is waste of money and there's nothing special about it. Check on YouTube the review. There's only one good review of it that too is a sponsored review from guys who received it free of cost. There is nothing special about it. Better practise. Cardistry with good eck of cards. And it's not useful at all to learn sleights .
These are good quality Threads ,
these have high invisibility but the strenght is not that good but if you have used elastic thread earlier and know the breaking point of it then these are the best loops for you..
This one is really good for sleight of hand tricks. Just got a few of this and I'm liking the grip and handling. Will love to have an empty shell for this coin though as that can add more interesting tricks to the mix.