With this special cup, you can make the included balls vanish, appear, multiply and shock your audience with surprise loads. The "Chop" feature lets you conceal a ball in the cup when it should be impossible! Includes one aluminum chop cup, two 1" knitted balls (one gaffed) and instructions. Many more routines can be found in books and DVDs. Cup stands approx. 3 3/8" tall with a mouth opening of 2 3/8".