Magic Tricks

I perform mainly up close Magic and the blackbirds seemed to be a godsend at first.
That was until I realized that the plastic is thin above the top of the coin and it can become deformed and actually hold the coin and place.
I noticed that regardless of the angle of positioning, they seem to only work flawlessly about half the time. The remaining half left me having to clap my hands order to jar the coins out of place.
They also prevent me from rolling up my sleeves as I tend to do under normal circumstances.