(MLB baseballs are bigger and less tacky than NPB baseballs ... Spin rate on a pitcher’s four-seam fastball does not vary much, not without a boost in velocity, anyway (or Spider Tack). Like any other ...

(MLB baseballs are bigger and less tacky than ... not without a boost in velocity, anyway (or Spider Tack). Like any other metric, though, it should not be taken in isolation.