Ollyball is the Ultimate Indoor Play Ball designed for full-speed and full-force indoor play. The ball weighs less than an ounce and absorbs shock with its patented KrunchCOR® construction. Kids can now safely play ball in the house in any weather, day or night. This alone is cool. What makes Ollyball the “Ultimate Indoor Play Ball” is that the Ollyball can also be colored-in with markers and crayons.