IT’S NOT uncommon to see balls of different kinds being used during practice sessions. Over the years we’ve seen batsmen using tennis balls, tennis balls that have been intentionally made wet and taped balls. Adam Gilchrist once won a World Cup final with half a squash ball in his gloves. But on Wednesday, the Eden Gardens witnessed a different kind of ball— one that is more in vogue in gully cricket matches — make an apperance as batting coach Sanjay Bangar gave throwdowns to Virat Kohli using a rubber ball.