What is "sherrin"

Sherrin is a brand of football used in Australian rules football and is the official ball of the Australian Football League, designed to its official specifications. It was the first ball designed specifically for the sport. Sherrin footballs are manufactured by Spalding, owned by Russell Corp Aus P/L, in Melbourne, Australia from cow hide lined and machine-stitched, but other sized models are often made in India or China, using synthetic rubber.