Made from a core of cork, which is layered with tightly wound string, and covered by a leather case with a slightly raised sewn seam. Must weigh between 5.5 and 5.75 ounces (155.9 and 163.0 g) and measure between 8 13/16 and 9 in (224 and 229 mm) in circumference. Use clue if u cannot get it still.