These are a set of four soft red magic sponge balls. Using these a magician can create some pretty spectacular sleight of hand type effects. Make the balls appear and vanish. They can multiply or jump from hand to hand. Almost unlimited routines you can do with sponge balls. These are great because it helps out your sleight of hand manipulating them.
These do not come with instructions or box.
On David Blaine’s Magic Man TV Special, he shows a sponge ball magic trick.