"Stoop ball (also spelled 'stoopball') is a game that is played by throwing a ball against a stoop (stairs leading up to a building) on the pavement in front of a building. ... Historically, it has been popular in Brooklyn and other inner cities. It first became popular after World War II." W - "A Spalding Hi-Bounce Ball, often called a Spaldeen, is a small pink rubber ball, somewhat similar to a racquetball, supposedly made from the defective core of a tennis ball without the felt."
Wikipedia, W - Spaldeen, SI - "Confessions Of A Stoop Ball Champion", The Big Apple
Wikipedia, W - Spaldeen, SI - "Confessions Of A Stoop Ball Champion", The Big Apple