You have 2 aluminum bowls which have been painted porcelain white. One is full to the brim with confetti the other is empty.
The confetti filled bowl is picked up and some of the confetti is blown away to show just how much there is in the bowl, The empty bowl is pick up and shown, then placed mouth down over the confetti.
A magic pass is made and the two bowls are separated to show the confetti having vanished and changed into a live dove! (or silks, spring flowers, etc.)!
The bowls are approx. 8" in diameter and 3 ½ "in height
These are still manufactued by Morrissey, but not very many magic stores carry them.  Sells new for around $48.00.  This set is in near mint condition.