"Obie" O'Brien's Kolossal Kolored Kards

Four jumbo cards are counted face up, showing them to be all the same. Upon turning one of them face down, you see a regular back. With a little magic rub, they all turn face down, showing four regular backs. Turning one of the face-down cards face up, another magic rub reveals that the other face-down cards are now face up. With a magic rub, you commence to show four different bright colored backs: blue, green, red, and yellow. Includes instructions. Very good condition.