The secret to this orange balls bounciness is in the hollow Sky Bounce rubber! Sky Bounce has been the standard in quality balls for the street game enthusiast since 1979. Nothing tops this original Sky Bounce Ball, for Handball, stickball, racquetball, stoopball, and other favorite street and playground games! Sky Bounce Ball - The ball that keeps on bouncin! Sky Bounce ball measures approximately 2.25" in diameter.