The basic routine is the magician vanishes a red silk.  He then lights a fire cracker and decides it's dangerous so he puts the explosive in a tube.  When the tube is opened, the firecracker has changed into the vanished silk and the firecracker is found hanging on a spectators back.  Very good condition, the bag that holds the effect has the actual Rings n' Things label, which is not alwas the case on these props.