Gravity tack can be easily colored with a marker

The tunnel crochet fastener

and the spectator is asked to read the top line (an eye chart is printed in bold black letters on the backs of all four cards which are examinable

Superior Silver Arrows Playing Cards by Jackson Robinson

Card Penetration Change (Cy Endfield)

SCORPION | Hugo Valenzuela Deganello Gravity tack can be easilyA scorpion catches a ring with its tail. This is the weirdest and most magical thing you will read in the year. Not only the effect is real, it will also take the ring out of a cell phone photo. The magician gives the audience a ring to sign. This ring is placed inside a box armed with playing cards by shaking the box the spectators listen inside the ring. The magician requests that a spectator hold the box in his hands and take a photograph of it.