This is a well made Aluminum chop cup. You place a ball in the cup and it magically jumps into your pockets. You place a ball on top of the cup and it magically penetrates the cup and is found to be inside the cup. Lot of routines possible with this chop cup and a lot of books have been written outlining the routines that can be done with the chop cups.
Buy three of these and you have an Aluminum set of the Combo Cups and Balls and you would have still paid far less than what you would have paid for these some place else.
The Chop cup measures around 3 1/2" in height and the balls have about a 3/4" diameter.